Document:

<PAGE>
                                                                     EXHIBIT 4.3

                               AMENDMENT NUMBER 2
                                TO THE INDENTURE

                  THIS AMENDMENT NUMBER 2, dated as of February 8, 2002 (the
"Amendment") to the Indenture, dated as of February 9, 2001 (as amended or
supplemented from time to time as permitted thereby, the "Indenture"), by and
between BRL Universal Compression Funding I, L.P. (the "Issuer") and Wells Fargo
Bank Minnesota, N.A. (f/k/a Wells Fargo Bank Minnesota, National Association),
as indenture trustee (the "Indenture Trustee").

                              W I T N E S S E T H:

                  WHEREAS, the Issuer and the Indenture Trustee have previously
entered into the Indenture;

                  WHEREAS, the parties desire to amend the Indenture in order to
modify certain provisions of the Indenture;

                  NOW THEREFORE, in consideration of the premises and mutual
covenants herein contained, the parties hereto agree as follows:

                  SECTION 1. Defined Terms. Capitalized terms used in this
Amendment and not otherwise defined herein shall have the meanings assigned in
the Indenture.

                  SECTION 2. Full Force and Effect. Other than as specifically
modified hereby, the Indenture shall remain in full force and effect in
accordance with the terms and provisions thereof and is hereby ratified and
confirmed by the parties hereto.

                  SECTION 3. Amendment to the Indenture. Pursuant to Section
1002 of the Indenture, effective on February 8, 2002, following the execution
and delivery hereof,

                  (a) The definition of "Appraisal Date" in Section 101 of the
Indenture is hereby amended to read in its entirety as follows:

                           Appraisal Date: The earlier to occur of (a) the date
                  of issuance of the Issuer's "Series 2002-1 Notes" and (b)
                  March 31, 2002 (or if such day is not a Business Day, the next
                  succeeding Business Day), and, thereafter, each anniversary
                  (or if such day is not a Business Day, the next succeeding
                  Business Day) of the occurrence of such earlier date.

                  (b) Section 632 of the Indenture is hereby amended to read in
its entirety as follows:

                           New Master Lease Agreement with Users. With respect
                  to each Head Lessee Compressor and each Head Lessor
                  Compressor, the Issuer shall (or shall cause such actions to
                  be taken), within the timeframe set forth below, cause each
                  related User to execute a revised master lease agreement,
                  substantially in the form of Exhibit C hereto. The Issuer
                  shall be deemed to be in compliance with this

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                                      -2-

                  Section 632 if Users representing one hundred percent (100%)
                  of the Aggregate Appraised Value have executed such revised
                  master lease agreement by the earlier to occur of (a) the date
                  of issuance of the Issuer's "Series 2002-1 Notes" and (b)
                  March 31, 2002 (or if such day is not a Business Day, the next
                  succeeding Business Day).

                  (c) The first sentence of Section 633 of the Indenture is
amended to read in its entirety as follows:

                           Within 90 days after the beginning of each calendar
                  year, beginning with the calendar year (i) if the Issuer has
                  issued its "Series 2002-1 Notes" on or before March 31, 2002
                  (or if such day is not a Business Day, the next succeeding
                  Business Day), 2003 or (ii) if the Issuer has not issued its
                  "Series 2002-1 Notes" on or before March 31, 2002 (or if such
                  day is not a Business Day, the next succeeding Business Day),
                  2002, the Issuer shall furnish to the Indenture Trustee, the
                  Deal Agent, each Rating Agency, and each Series Enhancer, an
                  Opinion of Counsel either stating that, in the opinion of such
                  counsel, such action has been taken with respect to the
                  recording, filing, re-recording and refiling of this
                  Indenture, any Supplements hereto and any other requisite
                  documents, and with respect to the execution and filing of any
                  financing statements and continuation statements, as are
                  necessary to maintain the Lien created by this Indenture and
                  reciting the details of such action or stating that, in the
                  opinion of such counsel, no such action is necessary to
                  maintain such Lien.

                  (d) Exhibit C to the Indenture is hereby deleted and replaced
in its entirety with Exhibit A to this Amendment.

                  SECTION 4. Covenants. Each of the Issuer and the Indenture
Trustee hereby confirms that each of the covenants, representations and
warranties set forth in Article VI and Section 911, as applicable, of the
Indenture are true and correct as of the date first written above with the same
effect as though each had been made as of such date, except to the extent that
any of such covenants, representations and warranties expressly relate to
earlier dates.

                  SECTION 5. Effectiveness of Amendment.

                  (a) This Amendment shall become effective as of the date first
written above.

                  (b) This Amendment shall be binding upon and inure to the
benefit of the parties hereto and their respective successors and assigns.

                  (c) On and after the execution and delivery hereof, (i) this
Amendment shall be a part of the Indenture, and (ii) each reference in the
Indenture to "this Indenture" or "hereof", "hereunder" or words of like import,
and each reference in any other document to the Indenture shall mean and be a
reference to the Indenture as amended or modified hereby.

                  SECTION 6. Execution in Counterparts. This Amendment may be
executed by the parties hereto in separate counterparts, each of which shall be
deemed to be an original and all of which shall constitute together but one and
the same agreement.

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                                      -3-

                  SECTION 7. Governing Law. THIS AMENDMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO CONFLICT OF
LAW PRINCIPLES; PROVIDED THAT SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL
OBLIGATIONS LAW SHALL APPLY, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE
PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH THE LAWS OF THE STATE
OF NEW YORK.

                            [Signature pages follow.]

<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have executed and
delivered this Amendment on the date first above written.

                                      BRL UNIVERSAL COMPRESSION
                                      FUNDING I, L.P.

                                      By: BRL Universal Compression Management,
                                          Inc., its General Partner

                                          By:/s/ Gregory C. Greene
                                             -----------------------------------

                                          Name: Gregory C. Greene
                                               ---------------------------------

                                          Title: President
                                                --------------------------------

                                      WELLS FARGO BANK MINNESOTA,
                                      NATIONAL ASSOCIATION, as indenture trustee

                                      By:/s/ Edna Barber
                                         ---------------------------------------

                                      Name: Edna Barber
                                           -------------------------------------

                                      Title: Assistant Vice President
                                            ------------------------------------

The undersigned hereby consent to
the amendment to the Indenture:

VARIABLE FUNDING CAPITAL
CORPORATION, as Holder and Requisite
Global Majority

By: First Union Securities, Inc., acting
    under the trade name Wachovia Securities,
    as attorney-in-fact

    By: /s/ Frank E. Weise VP
       -------------------------------------

    Name: Frank E. Weise
         -----------------------------------

    Title: Vice President
          ----------------------------------

                                                    AMENDMENT NO. 2 TO INDENTURE
<PAGE>

FIRST UNION SECURITIES, INC., acting
under the trade name Wachovia Securities

By: /s/ Robert A. Christensen
   -------------------------------------

Name: Robert A. Christensen
     -----------------------------------

Title: Vice President
      ----------------------------------

FIRST UNION NATIONAL BANK

By: /s/ Jane W. Workman
   -------------------------------------

Name: Jane W. Workman
     -----------------------------------

Title: Senior Vice President
      ----------------------------------

                                                   AMENDMENT NO. 2 TO INDENTURE<PAGE>

                                                                   EXHIBIT 10.8

                     AMENDMENT NO. 4 TO MANAGEMENT AGREEMENT

         THIS AMENDMENT NO. 4, dated as of November 8, 2001 (the "Amendment"),
to that certain Management Agreement (as amended, restated or otherwise modified
from time to time prior to the date hereof, the "Agreement"), dated as of
February 9, 2001, between Universal Compression, Inc. ( "UCI") and BRL Universal
Compression Funding I, L.P. ("BRL").

                                   WITNESSETH:

         WHEREAS, UCI and BRL desire to amend the Agreement;

         NOW THEREFORE, in consideration of the premises and mutual covenants
herein contained, the parties hereto agree as follows:

         SECTION 1. Defined Terms. Unless otherwise amended by the terms of this
Amendment terms used in this Amendment shall have the meanings assigned to them
in the Agreement.

         SECTION 2. Amendments to the Agreement. Effective at 8:00 a.m. (New
York time) on November 8, 2001, following the execution and delivery of this
Amendment (the "Effective Date"):

(a) Section (2) in the definition of "INCENTIVE MANAGEMENT FEE" set forth in
Section 1 of the Agreement is hereby deleted in its entirety and the following
shall be substituted in place thereof:

         "(2) if Universal or any of its Affiliates is not then fulfilling the
         role of the Manager, the amount designated as such to be set forth in a
         separate letter agreement among the Owner, Universal and the Back-up
         Manager."

(b) The first clause of Section (2) of the definition of "OPERATIONS FEE" set
forth in Section 1 of the Agreement shall be deleted in its entirety and the
following shall be substituted in place thereof:

         "(2) at all times not covered by clause (1) the actual operating costs
         actually incurred by a successor Manager in the Collection Period
         immediately preceding such Payment Date with respect to the Owner
         Compressors, including, without limitation, the actual direct costs of
         labor, materials, parts and supplies;"

(c) The first clause of Section (2) of the definition of "S&A FEE" set forth in
Section 1 of the Agreement shall be deleted in its entirety and the following
shall be substituted in place thereof:

         "(2) If Universal or any Affiliate thereof is not then fulfilling the
         role of the Manager the actual selling and administrative costs
         actually incurred by a successor Manager in the Collection Period
         immediately preceding such Payment Date with respect to the Owner
         Compressors;"

Amendment No. 4 to Management Agreement-Page 1

<PAGE>

(d) The definition of "SERVICES STANDARD" set forth in Section 1 of the
Agreement shall be deleted in its entirety and the following shall be
substituted in place thereof:

         " "SERVICES STANDARD" shall mean such efforts which are at a level of
         care, diligence and skill consistent with generally accepted industry
         standards and which are at least equal to the efforts used by Universal
         with respect to the UCI Compressors."

         SECTION 3. Representations and Warranties. Each of the parties hereto
hereby confirms that each of the representations and warranties set forth in the
Agreement made by such party are true and correct as of the date first written
above with the same effect as though each had been made by such party as of such
date, except to the extent that any of such representations and warranties
expressly relate to earlier dates.

         SECTION 4. Effectiveness of Agreement.

(a) This Amendment shall be binding upon and inure to the benefit of the parties
hereto and their respective successors and assigns.

(b) On the Effective Date, (i) this Amendment shall become a part of the
Agreement and (ii) each reference in the Agreement to "this Agreement", or
"hereof", "hereunder" or words of like import, and each reference in any other
document to the Agreement shall mean and be a reference to such Agreement, as
amended or modified hereby.

(c) Except as expressly amended or modified hereby, the Agreement shall remain
in full force and effect and is hereby ratified and confirmed by the parties
hereto.

         SECTION 5. Execution in Counterparts, Effectiveness. This Amendment may
be executed by the parties hereto in separate counterparts, each of which shall
be deemed to be an original and all of which shall constitute together but one
and the same agreement.

         SECTION 6. Governing Law. THIS AMENDMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO NEW
YORK'S CONFLICTS OF LAW PRINCIPLES, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF
THE PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK.

                            [signature page follows]

Amendment No. 4 to Management Agreement-Page 2
<PAGE>

         IN WITNESS WHEREOF, each of the parties hereto has caused a counterpart
of this Amendment to be duly executed and delivered as of the date hereof.

                                    UNIVERSAL COMPRESSION, INC.

                                    By: /s/ Ernie L. Danner
                                        -------------------
                                            Ernie L. Danner,
                                            Executive Vice President

                                    UCO COMPRESSION LLC

                                    By: /s/ Ernie L. Danner
                                        -------------------
                                            Ernie L. Danner,
                                            Executive Vice President

                                    BRL UNIVERSAL COMPRESSION
                                    FUNDING I, L.P.

                                    By:     BRL UNIVERSAL COMPRESSION
                                            MANAGEMENT, INC., its general
                                            partner

                                            By: /s/ Gregory C. Greene
                                                ---------------------
                                                    Gregory C. Greene, President

Signature Page - Amendment No. 4 to Management Agreement-Page 1
<PAGE>

                                    For the limited purposes
                                    set forth herein, Accepted
                                    and Agreed:

                                    WELLS FARGO BANK MINNESOTA,
                                    NATIONAL ASSOCIATION, not in its
                                    individual capacity but solely as indenture
                                    trustee

                                    By:    /s/ Edna Barber
                                           ---------------
                                    Name:  Edna Barber
                                           -----------
                                    Title: Assistant Vice President
                                           ------------------------

                                    Amendment No. 4 to the Management
                                    Agreement is hereby approved.

                                    FIRST UNION SECURITIES, INC., as deal
                                    agent

                                    By: /s/ Manoj Kumar
                                        ---------------
                                            Manoj Kumar, Vice President

                                    VARIABLE FUNDING CAPITAL
                                    CORPORATION, as note holder

                                    By:    First Union Securities, Inc., as
                                           attorney-in-fact

                                           By: /s/ Manoj Kumar
                                               ---------------
                                                   Manoj Kumar, Vice President

Signature Page - Amendment No. 4 to Management Agreement-Page 2

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