Question about 1993 Chevrolet Suburban

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The brakes are spongy. I have bled the hydrolics. After the pedal is pumped about 12 times they become spongy again but no fluid is leaking. could this be a problem with the ABS sensor

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This may be a ruber on the piston on the brakes my be worn

Posted on Mar 30, 2011

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2002 Chrysler town and country, always had soft brake pedal, replaced calipers and master cylinder bled brakes several times problem still there, suddenly pedal got full but brakes started dragging.


A soft or spongy brake pedal is an indicator that there is air in the hydraulic line(s) of your brake system.
Improper bleeding could be a cause.
Damaged or malfunctioning master cylinder could be another cause...
Damaged, crimped, or pin hole leak in the brake line...
Leaking or damaged wheel cylinder...
Poorly adjusted brake calipers...
Using the wrong type of DOT brake fluid...
Using brake fluid from a previously opened container that has been sitting around for more than 6-months (DOT type 3 and type 4 are glycol-based fluids that absorb water).

Feb 22, 2017 | Chrysler Cars & Trucks

1 Answer

2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

Jul 23, 2017 | 2001 Chevrolet Silverado 2500HD

3 Answers

Losing break peddle when stopping


You may have a fluid leak, look for any puddles where you park or wetness on the inside of your wheels. Also make sure that there is enough fluid in the fluid reservoir. This is a pretty serious issue as you could lose your brakes altogether if there is a leak or lack of fluid. I would not drive the vehicle and have it towed to a shop where they can find whatever is leaking. Alternatively, you could have air in the system which causes a somewhat spongy brake pedal feel. This could happen if the brakes were not bled properly after a brake job was completed. Either way, it is dangerous to drive in this condition and really should be dealt with ASAP.

Apr 04, 2011 | 1997 Volkswagen Jetta

3 Answers

My brake pedal goes to the floor?(spongy brake pedal) i added brake fluid and still have the problem.Do i need to bleed the brakes and if so whats the easiest way?


If you needed to add a substantial amount of fluid, good chance that something is leaking. You will not regain full pedal 'till that's repaired. Leak could be from a line, caliper or wheel cylinder. The master cylinder can also leak from the rear (check for a wet spot where it's bolted on)
If you did not need to add much, it's also possible that the master is internally bypassing and needs to be replaced.
Bleeding needs to be done after any hydraulic repair. Basic bleeding can be done by opening the r/r valve on the caliper or wheel cylinder and having someone hold the pedal down, then closing it as many times as necessary to get the air out, then doing l/r, r/f and l/f the same way.
Some ABS systems require special procedures so check haynes or chilton manual to see if anything extra is necessary. While bleeding, frequently check the fluid level...if it runs dry you need to begin all over again. Master cylinders should be pre-bled, then re-bled before bleeding remainder of the system (instructions should come with the part.)

Feb 02, 2011 | 1993 Nissan Pathfinder

1 Answer

We have bled the brakes at least 4 times and they are still spongy. It is a 1938 ford with a frame mounted master cylinder and discs front and back. GM Calipers on Front, Speedway Ford on Rear. Used a...


If no fluid is "leaking" from the brake lines (inspect visually) then the brakes should be bled with this method: Use 1/8 inch 2 foot long hose from parts store and attach the hose from bleeder valve ball on the brake caliper to a bottle partially filled with brake fluid. The end of the hose in the bottle must be submerged in some clean brake fluid in the bottle. With a second person holding the brake pedal to the floor, slowly turn bleeder valve counter clockwise (loosen tiny bit) with wrench and watch for dirty brake fluid to create bubbles in the bottle. When bubbles start, quickly tighten bleeder valve back to tight. Second person should lift foot, pump and then while valve is still tight should push the pedal to the floor again and THEN you again open bleeder valve slowly turning counter clockwise and watch for bubbles. Repeat until no more bubbles can be created in the bottle where the hose is submerged. Move to next caliper and repeat. For a firm brake pedal you will need to repeat this on all four calipers.

Jul 25, 2010 | 1995 Chevrolet Blazer

1 Answer

Red brake light flashing periodically - ??


Often this is because the brake fluid level is low. There is a sensor in the brake fluid reservoir that turns on the dash warning light when it does not sense enough fluid. You can visually check the brake fluid reservoir by looking at the reservoir under the hood. There are marks on the reservoir to show the correct level. If the fluid is low, this means that one of your brake system components is leaking fluid and needs to be replaced or repaired. If the fluid level is ok, possibly there could be air bubbles in the system, and it needs to be bled. If bleeding does not solve the problem, it could mean that the master cylinder is not holding pressure. If the brake pedal is spongy but it becomes firm after a few pumps, usually this means air in the system. If it stays spongy after pumping, and sinks continually when you press it, probably the master cylinder needs to be checked.

Mar 15, 2010 | Volkswagen New Beetle Cars & Trucks

3 Answers

Left exhaust manifold continues to warp and leak


Brake Pedal not firm enough.

1. I suspect deteriorated brake fluid, some air in the brake lines and tired flexible brake hoses which are past their useful life.

If the brake fluid has not been changed in the past 12 months then have the brakes bled and new DOT 4 spec brake fluid replaced in the system. (Brake fluid must be bled out and changed at least every 2 years). At the same time look for signs of any minor brake fluid leaks or fluid weeping.

2. In a vehicle of that age I would also be replacing all flexible brake hoses before bleeding the brake system again. These flexible hoses deteriorate badly with age and will swell significantly when you apply pressure to them contributing to a soft pedal feel. This is not expensive to have done and, given the safety importance of the braking system, it is imperative to keep the brakes in decent working condition. Ensure you only use very good quality brake hoses.
Once the brake hoses are fitted, the brake system is bled and the new brake fluid is added into it at the same time.

With everything tight, new hoses and new fluid in the system you should have a solid pedal assuming everything else is ok.
(I doubt that the ABS sensors on your vehicle have anything at all to do with the soft pedal you are concerned about but we cannot test this. It is much more likely that the issue is more fundamental as explained above.
On this site we frequently do not have enough information about a vehicle to offer as much information and comment as we would like).

I hope this helps.

Cheers
Sean

Dec 22, 2009 | 1998 Chevrolet K3500

1 Answer

Replaced front pads, now brake pedal is very soft and goes to floor more than it should.


h i from uk if pedal was ok prior to pads change ? then pardon me for suggesting go back to each caliper and make sure you have fitted the spring that hold caliper to its mounting correctly as if not this will allow pads to withdrawer when pedal off but will be able to pump pedal to good feel also these springs do not come into contact with outer pads ! they only keep caliper sprung/secure in placealso have you bled the front calipers ? it is a fact that your brake fluid does absorb moisture over time and also fluid absorbs high temps by conduction from pads and thro the piston of caliper resulting in fluid being o/heated over time then it becomes compressable hence spongy pedal occures it is recommended in service shedules that fluid be flushed at intervals /12 months ? to confirm a point if you blead calipers into clear jar ? you will notice 1st couple of pumps you bleed the flui will be dark brown/black ? b4 freash clear fluid emerges just try it ? you should do this each time work such as new pads/shoes are fitted on any vehicle if you have any more info as to what you discover please come back with results as your vehicle is 2006 i would not suspect there is a fault that req's more expendature at this time ?

Nov 15, 2009 | 2006 Hyundai Tucson

2 Answers

Brake are pungy on04gmc envoy


it would sound like your master cylinder if you did bleed your brakes right.

Aug 25, 2009 | 2004 GMC Envoy

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