Question about 1997 GMC Yukon

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Spongy brakes, anti lock disabled and brakes won't lock-up when applied hard. Brake warning light is on. Lines have been bled with no change. No detectable leaks. Replaced front calipers, rear wheel cylinders and bled system with no improvement. Master cylinder?

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  • Master
  • 524 Answers

Yes master cylinder and maybe ABS sending unit. Also is there a sound of an air leak it may also be your brake booster

Posted on May 03, 2010

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2 Answers

Anti-lock system light on


Anti-Lock Braking System (ABS)
Purpose Anti-lock brake systems (ABS) - generally also referred to as anti-lock
systems (ALS) - are designed to prevent the vehicle wheels from locking
as a result of the service brake being applied with too much force, especially
on slippery road surfaces.
The idea is to maintain cornering forces on braked wheels to ensure that
the vehicle or vehicle combination retains its driving stability and manoeuvrability
as far as physically possible. The available power transmission
or grip between tyres and carriageway should also be utilised as
far as possible to minimise the braking distance and maximise vehicle
deceleration.
Why ABS? Although today commercial vehicle brakes are designed to a very high
technical standard, braking on slippery roads often results in potentially
dangerous situations. During full or even partial braking on a slippery
road it may no longer be possible to fully transfer the braking force onto
the road due to the low coefficient of friction (friction coefficient (k)) between
the tyres and the carriageway. The braking force is excessive and
the wheels lock up. Locked wheels no longer provide any grip on the
road and are almost incapable of transferring any cornering forces
(steering and tracking forces). This often has dangerous consequences:
- The vehicle becomes unsteerable
- The vehicle breaks away in spite of countersteering, and starts to
swerve.
- The braking distance is significantly increased
- Tractor-trailer combinations or semitrailer trains may break away or
jackknife.
Load sensing valve influence On dry roads today's load sensing valves (ALB) alone are often capable
of preventing the wheels from locking if the vehicle is unladen; they also
help the driver to effectively grade the braking process on wet road surfaces,
but they are unable to prevent locking as such (no slip monitoring).
In addition, they are unable to counteract any overreactions on the
part of the driver, or any variances in frictional or adhesion coefficients
which may apply to different sides of the vehicle, or indeed to its different
axles (?-split road surfaces).
Benefits of ABS: Only the Anti-Lock Brake System (ABS)
- guarantees stable braking characteristics on all road surfaces.
- maintains steerability and generally reduces the braking distance
- prevents vehicle combinations from jackknifing
- reduces tyre wear.
Limits of ABS Although ABS is an effective safety device, it can not suspend the limits
defined by driving physics. Even a vehicle fitted with ABS will become
uncontrollable if driven too fast around a corner.
So ABS is not a licence for a maladjusted style of driving or failure to observe
the correct safety distance.
4
ABS Training Anti-Slip Regulation (ASR)
Anti-Slip Regulation (ASR)
Why ASR? Increasing the engine output (accelerating) on a slippery road surface
can easily lead to the maximum adhesion on one or all powered wheels
being exceeded causing them to spin, especially if the vehicle is unladen
or partially laden.
Spinning wheels when driving off or accelerating represent a safety risk
just like locked wheel do when braking.
Reasons - Wheels that spin transfer just as little cornering force as locked
wheels.
- They also no longer transfer any tractive power onto the road.
Consequences - Vehicles that do not move or get stuck.
- Vehicles that can no longer be steered, jackknife on uphill uphill
gradients, or swerve in corners.
Benefits of ASR ASR prevents the powered wheel from spinning and provides the following
benefits:
- Tractive power and cornering forces are maintained.
- Stable driving behaviour is ensured when moving off, accelerating
and negotiating corners on slippery roads.
- The indicator lamp (if installed) is used to warn the driver of slippery
road conditions.
- Tyre wear is reduced to a minimum, and the motor vehicle's drive
train protected
- The risk of accidents is further reduced.
ASR and ABS: ASR represents a worthwhile addition to an ABS-controlled braking system.
All that is required to turn ABS control into full ABS/ASR control is
an ECU with the additional ASR function and a few additional components
for controlling the differential brake and the engine. This why ASR
is only available in combination with ABS.
Even a differential lock for off-road use and ASR do not exclude but complement
each other.
Limits of ASR The traction capacity of an all-wheel driven commercial vehicle can not
be achieved by a motor vehicle with only one driving axle - not even with
optimal ASR.

anti-lock-system-light-vi1ay411tmzjz03ru4fkmxgj-5-0.jpg

anti-lock-system-light-vi1ay411tmzjz03ru4fkmxgj-5-2.jpg

Feb 28, 2012 | 1994 Cadillac DeVille

2 Answers

Changed brake pads and used a c-clamp to retract the piston in the caliper, never bled the brakes and my wife was driving the van 2 weeks later, applied the brakes and the peddle went right to the floor,...


Bleed the brakes, but it will probably still feel spongy. When you compress the Caliper you need to open the bleeder valve to release the pressure. It sounds like you busted the diaphragm in the proportioning valve. It is a costly mistake but one made alot now that more and more vehicles have anti-locking breaks. If bleeding and replacing the fluid do not help at all then I bet on the proportioning valve.

Apr 24, 2011 | Chevrolet Uplander LS Cars & Trucks

1 Answer

How to rectify brake pedal spomgy,hard,creeping down


Your brakes need bleeding to get the air out of the system.You say the pedal is hard but also spongy?Get the brake booster checked.Get the lines bled for any air.Hope this helps

Feb 10, 2011 | Toyota Corolla Cars & Trucks

2 Answers

I changed the front pads on my 97 Sebring convertible. Also put on new rotors, and changed the calipers. My car bounces slightly, and if I apply the brakes hard, they become spongy. I have bled them off as...


Spongy means air present in the hydraulic system,I recommend check and recheck all of the brake system areas where air could enter(master cylinder,fittings,calipers,etc.)and bleed the entire system again.
Good luck !

Feb 02, 2010 | 1997 Chrysler Sebring

1 Answer

Brake warning comes on. Brakes are good. change senors . 2003 E320 90,000 miles


The brake sensor does many jobs. It senses air in the brake lines, electrical problems with the anti lock system, any other systems associated with the brakes. Have your brake system bled and all systems checked before changing the sensors.

Jan 14, 2010 | 2003 Mercedes-Benz E-Class

1 Answer

I have a 1994 nissan pathfinder, I recently changed the master cylinder, and the brakes did not change..speeding up and then applying the brake Its hard and then goes spongy but will stop but with to much...


Take the rear brake adjustes out as far as you can get them,locking up the wheels,then back them off just enough to get them to turn,you should get you pedal back.

Nov 01, 2009 | Nissan Pathfinder Cars & Trucks

1 Answer

Brakes won't bleed!


the brake system on these units cant be bled at home if air gets into themaster cylinder and or the (hcu) hydraulic control unit,a special anti-lock brake test adapter has to be pluged into the control module, any atempt to bleed the system with out this tool wiil result in a spongy pedal

Jul 02, 2009 | 1998 Ford Expedition

1 Answer

Anti lock brake light on dash in 1995 gm yukon


sounds to me like the abs relay is bad maybe $75 repair at the dealer

May 04, 2009 | 2002 Ford F250 Super Duty SuperCab

1 Answer

1997 chevy malibu brake problem


bleed the abs unit first then bleed all the brakes

Mar 22, 2009 | 1997 Chevrolet Malibu

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