Spongy pedal , low brake pedal

  • Bigclint07
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4 months 1 week ago #202634 by Bigclint07
Spongy pedal , low brake pedal was created by Bigclint07
2006 GMC Sierra 4.3L engine 2wd truck

Recently changed booster and master due to fluid leaking into booster making a failed booster . Pedal is not the same since I changed this . Could it be ABS maybe has air trapped in module ? How can I manually bleed without scanner or shop ?

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3 months 2 weeks ago #202815 by CrankyGuy
Replied by CrankyGuy on topic Spongy pedal , low brake pedal
I may be asking a dum question, but did you bench bleed the master cylinder and adjust the push rod inside the brake booster? If not this will be the issue. ABS systems are very sensitive, so if when it fails you won't even feel the difference. But, it will not cause the brake pedal to suffer the way you describe it. Don't forget to do a bleed in the whole system even after you had bleed the master cylinder.

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  • The Crafty Tech
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3 months 2 weeks ago #202838 by The Crafty Tech
Replied by The Crafty Tech on topic Spongy pedal , low brake pedal
Used to use a shop scanner with an abs bleed feature for that one. Dont know of any other way. It used about a liter of fluid. Usually thats after leaving the system draining for a while and pumping the brake with an empty res.

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