Question about 1995 Chevrolet Lumina Apv

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ABS Light is on. rear drum brakes have no pressure to them....wheel cylinders are not seized., but will not activate when pressure is applied to the brake pedal, even with drums and shoes off

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If you recently replaced the wheel cylinders or if you ran it out of brake fluid, you need to adjust the brakes out and then fill and bleed out the air on the wheel cylinders

Posted on Aug 27, 2010


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1 Answer

Where is the Rear brake equaliser Mercedes Benz c220 elegance

because the rear and front brakes have different braking ability because of disc rotor size and or rear drum brakes it is necessary to reduce the braking efficiency of the rear brakes to stop the rear end skidding out on sharp stops, wet roads and inclines . To do this there is a small pressure regulator ( equaliser) that allows some pressure through at partial brakes eventually increasing the pressure available to full brakes .IT may be in the ABS unit if you have one or in the rear hydraulic line under the body. The failure rate of this unit is exceedingly small so I would be checking things like pad/lining thickness and seized caliper pins that are not allowing the caliper to centralise and allow both pads to work on the discs or seized pistons in the wheel cylinders that is not allowing full pressure onto the shoes in the drums

May 22, 2014 | Mercedes-Benz 220 Cars & Trucks

1 Answer

Can a rear abs sensor cause the brake on that wheel to apply,smells like hot brakes when you stop

Yes and No. When ABS get activated it gives a pulsation of fluid pressure to that wheel it detect through the sensor that is at lock up. It prevents brake lock up and keeps you straight with the ability to steer. If you are smelling brakes you need to check the pad a caliper can stick or even a binding rear wheel cylinder.

Feb 24, 2012 | Ford Explorer Cars & Trucks

1 Answer

Back right tire seized up and won't turn

this problem is caused by the 4 wheel active (needs no input from driver to apply brakes) anti-lock brake hydraulic controller has a leaking high pressure poppet valve to that wheel, u will need to replace the control valve, they sell rebuilt units. This is a fairly common problem on active ABS systems with traction control.

Sep 30, 2010 | 2001 Cadillac DeVille

2 Answers

I replaced the brake master cylinder on my 91 Lincoln Mark 7 with a non high pressure master cylinder and the rear brakes do not hold. Do I need to change the cal. on the rear also?

ANTI-LOCK BRAKE SYSTEM (and HCU-Hydraulic Control Unit)
General Information The 4-Wheel Anti-lock Brake System (ABS) is an electronically operated, all wheel brake control system. Major components include the power brake booster, master cylinder, the wheel speed sensors, and the Hydraulic Control Unit (HCU) which contains the control module, a relay, and the pressure control valves. The system is designed to ****** wheel lockup during periods of high wheel slip when braking. Retarding wheel lockup is accomplished by modulating fluid pressure to the wheel brake units. When the control module detects a variation in voltage across the wheel speed sensors, the ABS is activated. The control module opens and closes various valves located inside the HCU. These valves, called dump and isolation valves, modulate the hydraulic pressure to the wheels by applying and venting the pressure to the brake fluid circuits. Some models are equipped with a Traction Assist (TA) system. The TA system senses wheel spin upon acceleration, turns on the Hydraulic Control Unit (HCU) pump and applies fluid pressure to the appropriate rear wheel. Two additional isolation valves in the HCU will also close to permit fluid to flow only to the rear wheels. The TA system monitors TA usage to avoid overheating the rear brakes. If the system does sense brake overheating, the ABS module will inhibit TA operation until the rear brakes are permitted to cool down.
SYSTEM COMPONENTS The anti-lock brake system consists of the following components:
  • Vacuum booster and master cylinder assembly
  • Hydraulic Control Unit (HCU)
  • ABS module
  • Wheel sensors
  • Pedal travel switch
On 1992-1994 and 1995-00 a scanner is used to perform the brake bleed. But on yours, I think it's different according to the manual.
What do you mean change the cal. on the rear also? Do you mean Caliper?

Jul 26, 2010 | 1991 Lincoln Mark VII

2 Answers

Rear brakes locking(until abs kicks in) with little front brake application and very light pedal pressure. also have really poor hard/emergency braking response, vehicle doesnt stop as aggresively as it...

It could be a proportioning valve, and there's also the chance that the portion of the master cylinder that operates the front brakes is going bad. Have you had a pressure check done on the front brake system? Also, some vehicles have a variable proportioning valve, so that when the vehicle is loaded, it allows more pressure to the rear brakes. These can sometimes stick in place, causing the fault that you describe. Hope this helps you out.

Dec 01, 2009 | 2002 Dodge Durango

4 Answers

Sporadically, the rear brakes on my 1998 Chevrolet Silverado 4WD truck will lock up with the slightest pedal pressure. Today the problem repeated itself and was accompanied by a loud electronic sound. My...

if you have abs the electic noise you hear is most likely coming from the abs modulator. as for the rear brakes intermittently locking up, the most common problem is overadjusted rear brake shoes, under adjusted rear brake shoes, or excessive brake dust inside the drums.

Oct 28, 2009 | 1998 Chevrolet C1500

1 Answer

Uneven brake pressure at rear

If this is an ABS equipped vehicle, have the ABS unit itself tested. Or for ABS and Non ABS, Have the rear wheel cylinders replaced if it is drum brakes in the rear

Oct 21, 2009 | 1989 Daihatsu Charade

1 Answer

K10 2005 rear drum. Both Front calipers will

Most likely the master cylinder.
The internal spring is not returning the piston back to the "release" position.
If you had it serviced, then the pushroh between the booster and master cylinder may be too long, so that the piston in the master cylinder can't fully go back. Leakage in the master cylinder piston overnight will bring it to rest.

Unplug the ABS module ... if brakes continue to seize, then it is the master cylinder. If not ...

Hope this helps!

Sep 15, 2009 | 2005 Chevrolet Silverado

2 Answers

1994 Cavalier -replaced master cylinder-no pressure to rear brake

The most common bleeding procedure is to bleed the ABS brake furthest from the master cylinder first, then bleed the other brake that shares the same hydraulic circuit (which may be the other rear brake on a rear-wheel drive car, or the opposite front brake on a front-wheel drive car or minivan). After these have been bled, you then bleed the other brake circuit starting with the furthest brake from the master cylinder.
Air can be very difficult to remove from an ABS modulator assembly because of all the nooks and crannies inside the unit. The modulator may have eight to 10, or more, ABS/traction control solenoid valves, plus various check valves and dead-end ports. Some ABS modulators have special bleed screws to help you vent the trapped air when bleeding the system. Others do not and require the use of a scan tool to cycle the ABS solenoids while you bleed the system. 1. To bleed the isolation valves in the modulator, there are two bleeder screws. Start with the one toward the engine. Turn the ignition on and apply light pressure on the brake pedal. Open the bleeder screw and allow the fluid to flow until clear. Close the screw and do the same at the second bleeder screw. 2. Depressurize the accumulator by pumping the pedal 40 times with the key off. Wait about two minutes for the brake fluid to de-aerate, then refill the fluid reservoir with DOT 3 brake fluid. 3. Now you can bleed the boost section. This is done by applying moderate pressure on the brake pedal and turning the ignition on for three seconds, then off. Repeat this a total of 10 times. Make sure the pedal feels firm when you have finished, and give the car a road test to make sure the brakes are working properly.

Mar 15, 2009 | 1994 Chevrolet Cavalier

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