Question about 1987 Jaguar XJ6

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87 jag xj6. Brake pedal spongy goes all the way

87 jag xj6. Brake pedal spongy, goes all the way to the floor. Bled brakes, no better. What next?

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  • baileylk Jul 23, 2009

    No leaking by Brake booster, is that what I am supposed be looking for?

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  • Master
  • 2,187 Answers

If the brake lines and fluid is clear then you may have to look at the brake booster found at the other end of the brake pedal under the hood...

Posted on Jul 23, 2009

  • Nicolo Carlo Parazo Jul 23, 2009

    the diaphragm may need replacement. You need to physically inspect the unit to be sure.

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Posted on Jan 02, 2017

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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

2 Answers

Have no brake pressure, pedal goes straight to floor, put on new calipers and pads and bled the lines but I am no better off.


Sounds like a bad brake booster. To test, pump up the brakes with the engine off. While holding the brake pedal down,start the car. The brake pedal should drop a couple of inches and hold. If it doesn't, replace the booster.

Jul 25, 2011 | 1996 Jeep Grand Cherokee

1 Answer

I changed rear brake pads. I clamped brake line, opened bleeder and the collasped the piston. Same on both sides. Now the pedal is spongy. Bled the rear brakes. still spongy. Help


get someone to stamp on the pedal when your opening the bleeder and close it before he/she hits the floor with there foot.may take several attempts.

Aug 21, 2010 | 2005 Ford Expedition

2 Answers

Spongy brake pedal


I have a 2001 Chevy 1500 4 X 4 that recently had all new pads, rotors, and calipers installed. Since then my brake pedal goes almost to the floor before I get any brakes. I took it back to the shop and they bled the brakes with no better results. I bled them also with no results. I took the truck back and they installed a master cylinder with no results. It's now at the Chevy dealer and they say it's normal - BS! I had good brakes before I had all of the brake parts replaced, no one can figure it out. If you have a load in the truck or if you tow anything you better be looking at the ditch to avoid an accident. The original brakes would put you nose into the windshield and now I could stop it better the Fred Flinstone way. Anyone have an answer????????

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3 Answers

Brakes are still spongy after changing the pads, one caliper, and master cylinder. bled front brakes.


I just went to Brake Masters this morning and had them replace the Master Cylinder since I was experiencing the pedal very spongy and going to the floor. When they replaced the Master Cylinder and they gave me back the car, the brakes were still spongy and going to the floor. I addressed this to them and they took another look at it, but when I took it for a second time, the brakes were extremely spongy. It was almost like they gave me back my car in worst condition to when I brought it in. Can you help?

May 21, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Brake pedal is spongy


how did you bled them back 2 front?

Mar 27, 2009 | 1989 Ford F 150

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2005 f150 spongy brakes


possibly new master cylinder is defective

Mar 24, 2009 | 2005 Ford F-150

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