06 Hydroboost Spongy Brakes - Chevy and GMC Duramax Diesel Forum
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post #1 of 5 (permalink) Old 12-27-2010, 11:47 AM Thread Starter
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06 Hydroboost Spongy Brakes

I've got a 06 2500hd with 35k miles and at 19k miles i had those same spongy brakes, hydroboost system also, now this dealer has replace my rotors ( thats why there spongy) then he replace the ABS, then the master cylinder then the Hydroboost. In the morning i jump into this truck of mine and push the brake pedal to the floor, humm sounds like air in the system to me but what do I know, so overall this truck is at another dealership awaiting another opinion of what else could be wrong with my spongy brakes. Any ideas ?
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post #2 of 5 (permalink) Old 12-27-2010, 12:49 PM
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have you tried flushing the ps/hb system? Get the old stuff out, perhaps try some sythetics.
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post #3 of 5 (permalink) Old 12-27-2010, 01:24 PM Thread Starter
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Ps/Hb flush

I've investigated many forums of this also and gave the info to the dealership but who knows if they flushed, though they did install a new H/B. When a dealership says your spongy brakes are from the rotors being rusted I was really thinkin this guy knows his brake system. This truck is still under warranty and GM phone reps are workin with me. They call up and say mumbo jumbo thank you and we'll call you back with more mumbo jumbo. So this is were i'm at .. almost month and a half w/o my truck luckily I have another backup vehicle...
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post #4 of 5 (permalink) Old 12-27-2010, 02:06 PM
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Spongy feel to the pedal, with only 19k miles, and the age of the truck…I'd start with a full flush of the brake fluid from the Master on down.

Flush the fluid annually, regardless of miles driven…and never more than 2 years (you were past that at 19k). The moisture content after only 12 months can lower the fluid’s boiling point by several hundred degrees.

They work together, flushing the brake system and flushing the PS/HB system is fairly inexpensive and easy to do on your own if you wish. There’s some ‘How-to’ threads here on the forum.

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post #5 of 5 (permalink) Old 12-28-2010, 07:02 PM Thread Starter
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Mushy Brakes

Well got my truck back from another dealership, there answer is my pedal travel is within limits, system operating and designed mushy feel due to designed in over pressure protection. end of story
well thats what they think, it still is mushy
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