Question about 1999 Pontiac Sunfire

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Proportioning valves in down position

Does the ABS unit have ability to reset pro.valves? Both are down. I have no brakes,except manual handle,nearest garage is 30 miles...what can i do?

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  • Randy Hamilton Jul 13, 2013

    I am going to remove both pistons from the valve body and try to get fluid back to rear drums...then replace pistons for more pressure...

  • Randy Hamilton Jul 13, 2013

    GM discontinued valve kits for this brake system 8 years ago, and replaced brake system in 2000+ models, not a good sign.

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  • 3 Answers

Did you open brake system lines? If you did they need power bled. If not sometime proportions do go bad.

Posted on Jul 13, 2013

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Posted on Jan 02, 2017

juncro
  • 467 Answers

SOURCE: I have a 2001 pontiac aztec with rear drum brakes.

to do this you will have to change the entire rear axle, to one with disc brakes

Posted on Jul 30, 2009

ministock48
  • 258 Answers

SOURCE: Brake fluid is not getting to the rear brakes.

there more than likely air in the abs system and there should be bleeders on the abs module try bleeding the abs system first then once you have good fluid there then bleed the rear brakes again

Posted on Oct 18, 2009

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Related Questions:

1 Answer

Where is ABS fuse located?


In the under hood fuse/relay box.

ETC / ECM - 15amp

ABS - 60amp

SEO B2 30 amp

no B+ at any of these fuse's check Ignition 1 relay .


This vehicle is equipped with the Bosch 5.3 antilock braking system.



The vehicle is equipped with the following braking systems:







?€¢





Antilock Brake System (ABS)














?€¢





Dynamic Rear Proportioning (DRP)















?€¢





Traction Control System TC2 (w/NW9)








The following components are involved in the operation of the above systems:







?€¢





Electronic Brake Control Module (EBCM) - The EBCM controls the system functions and detects failures.

















The EBCM contains the following components:
















-





System Relay - The system relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves and pump motor.
















-





Vent Tube - The vent tube, located in the EBCM connector, is an opening to the internal cavity of the EBCM. It allows ventilation of the EBCM internals.















?€¢





Brake Pressure Modulator Valve (BPMV) - The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The vehicle is equipped with traction control The BPMV uses a 4 circuit configuration with a front/rear split. The BPMV directs fluid from the reservoir of the master cylinder to the front wheels and fluid from the other reservoir to the rear wheels. The circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.







Oct 31, 2015 | 2003 Hummer H2

2 Answers

How to diagnose an ABS problem


You need to find out what code is stored in the ABS control module, if the light is on there is a DTC an the system is disabled ! Don't know if auto part stores can pull ABS codes or not , You'll have to check it out . Personally I say take it to a ASE certified repair shop if you don't know anything about anti lock brakes !
?€¢
Electronic Brake Control Module (EBCM) -- The EBCM controls the system functions and detects failures.


The EBCM contains the following components:


?€¢
System Relays -- The inlet and outlet solenoid relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves, the pump motor relay is energized and supplies battery positive voltage to the pump motor when ABS is activated.


?€¢
Brake Pressure Modulator Valve (BPMV) -- The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.


This system can store 10-12 DTC's for something simple as wheel speed sensors to wiring problems to a malfunction of the EBCM . Some of these problems you would need a professional type scan tool ! The antilock brake system on your vehicle is the
BOSCH 8.0 antilock braking system
The vehicle is equipped with the following braking systems:
?€¢
Antilock Brake System (ABS)


?€¢
Dynamic Rear Proportioning (DRP)


?€¢
Traction Control System (TCS) (w/NW7)

The following components are involved in the operation of the above systems:
?€¢
Electronic Brake Control Module (EBCM) -- The EBCM controls the system functions and detects failures.


The EBCM contains the following components:


?€¢
System Relays -- The inlet and outlet solenoid relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves, the pump motor relay is energized and supplies battery positive voltage to the pump motor when ABS is activated.


?€¢
Brake Pressure Modulator Valve (BPMV) -- The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.


Important: There is a rubber isolator located under the BPMV and on the mounting studs. The rubber isolators protect the BPMV and the EBCM from vehicle vibrations.


?€¢
The BPMV contains the following components:


-
Pump Motor


-
Inlet Valves (one per wheel)


-
Outlet Valves (one per wheel)


?€¢
Wheel Speed Sensors (WSS) -- As the wheel spins, the wheel speed sensor produces an AC signal. The EBCM uses this alternating current signal to calculate wheel speed. The wheel speed sensors are replaceable only as part of the wheel hub and bearing assemblies.


?€¢
Traction Control Switch (w/NW7) -- The TCS is manually disabled or enabled using the traction control switch.


?€¢
Stop Lamp Switch - The EBCM uses the stop lamp switch as an indication that the brake pedal is applied

Sep 21, 2015 | 2006 Saturn ION

1 Answer

Can you just replace the O-rings on a 2001 dodge ram 1500 brake proportioning valve?


A proportioning valve is not servicable. I dont remebmer a bleeder on these. Are you sure you dont mean the master cilinder or the abs unit?

Dec 20, 2014 | Dodge Cars & Trucks

1 Answer

I removed my abs system on my 95 gt mustang and now no brakes


You can not remove the ABS hydraulic control module from cars that come with it. Cars without ABS have a device called a proportioning valve. This valve is designed to supply 70% of the stopping power to the front brakes and the remaining 30% to the rear. Without this valve, the rear brakes would constantly be locking up. On cars with ABS, that valve is built into the ABS unit. Your only other option is to obtain and install the master cylinder and proportioning valve from the version of your car that came without ABS. FYI, some cars come with ABS as standard equipment, so there would be no variant without ABS. It's to late for your current ABS unit, however you need to know that you are supposed to flush your brake fluid every two years. Failure to do this causes a build up of moisture in the fluid. Automotive brake fluids absorb moisture from the air. The system is not totally sealed. The cap on the fluid reservoir has a tiny vent hole in it, needed for the fluid to flow into and out of the master cylinder. This is how the moisture gets absorbed. This moisture corrodes the inside of all the hydraulic parts of the system. Brake fluid when new is either clear or the color of ginger ale [pale yellow] as it ages, it darkens. After two years, it starts to turn brown. It will be totally black after 4 to 5 years. Failure to flush the fluid every two years damages your brake's hydraulic system components. Flush the fluid every two years and NONE of the hydraulic components will go bad.
Charlie

Apr 20, 2014 | 1995 Ford Mustang

1 Answer

Front brakes


if the proportioning clogs or damaged it can cause brake problems such as yours take pressure readings on all 4 calipers the proportioning valve is just as it says differentiates the pressure front to back also the abs unit itself can cause the same problem also

Jun 25, 2013 | 2000 GMC Envoy

1 Answer

Brake light on


2 things cause this 1 is the parking brake is not fully released 2nd is that the brakes were bleed incorrectly and the proportioning valve switch has slid forward turning on the light if your brakes were repaired recently the you can try to reset the valve by stopmping on the pedal hard 4 or 5 times if this does not work you will have to take it to a shop to have the position rod reset now understand this is for the red brake light not the abs light

Mar 26, 2012 | 2002 Buick LeSabre

1 Answer

How to bleed brakes on 98 regal, I changed rear brake lines but I don't think fluid is going thru the proportioning valve or ABS. I am used to the older brakes ( 70's and down.)


sometimes you can tap on the proportioning valve while someone pumps the brake if nothing breaks loose you may have to replace the valve.

Aug 07, 2010 | 1998 Buick Regal

1 Answer

How do you reset the proportioning valve on an a.b.s. system on a 1998 Chev. cavalier brake system .There is no brake fluid going to the two rear wheels


computer does that, or you have to have enough brake fluid preasure also, check for leaking lines (brake lines). make sure fluid is full.abs system has dump valves , if there was a problem abs light would be on. but abs might lite if not enough preasure hope this helps.

Oct 10, 2009 | 1998 Chevrolet Cavalier

1 Answer

Very little (almost nonexistent) rear brakes. Cannot stop rear wheels even with wheels off the ground. Replaced MC, wheel cyl.,Rubber hose, booster, proportioning valve, bypassed rear ABS, shoes, drums,...


What happens when you try to bleed the rear brakes? If nothing comes out, trace each line back toward the proportioning valve--something would be blocking flow of fluid. Disconnect each line at the forward end and see if fluid comes out of the valve openings. You will need a scan tool to complete the bleeding process with ABS. Suggest buying a Chilton's manual for this truck because of the complexity of the ABS system.

Sep 30, 2009 | 1997 Dodge Dakota

1 Answer

The ABS/proportioning valve is not working.


these trucks need a seperate bleed procedure for ABS you need a scanner to put it into this bleed mode,hope this helps if not get back to me and we'll go from there. please rate my fix as i strive to be the best

May 19, 2009 | 1997 Chevrolet Blazer

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