Spongy Brakes Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SS Tim · 04-08-2014, 02:48 PM

Do not continue to drive the truck like this!
If the light is on you are/were seeing a pressure differential between the two sides of the system. Spongy is due to air in the system. If you can't get a good flow at the bleeders its probably the master cylinder. Sounds like the system has not been serviced (or flushed) in a while if you had to drill out a bleeder. Did you carefully check all four wheel cylinders for leakage, including under the cups?
Might just want to pull up the factory manual and do a systems review in chaper 5 on the brakes and the distribution valve/warning lamp functions.

LSUMurse · 04-08-2014, 03:03 PM

I did not check under the cups, I will do that the next time I get a chance to work on it. I rarely drive the truck now, mostly just to test something I've tinkered with the engine about. I guess I'll get a new MC and flush the system and see if that helps.

04-08-2014, 02:48 PM	#1
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Spongy Brakes Question Do not continue to drive the truck like this! If the light is on you are/were seeing a pressure differential between the two sides of the system. Spongy is due to air in the system. If you can't get a good flow at the bleeders its probably the master cylinder. Sounds like the system has not been serviced (or flushed) in a while if you had to drill out a bleeder. Did you carefully check all four wheel cylinders for leakage, including under the cups? Might just want to pull up the factory manual and do a systems review in chaper 5 on the brakes and the distribution valve/warning lamp functions. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

04-08-2014, 03:03 PM	#2
LSUMurse Registered User Join Date: Mar 2012 Location: New Orleans, La Posts: 406	Re: Spongy Brakes Question I did not check under the cups, I will do that the next time I get a chance to work on it. I rarely drive the truck now, mostly just to test something I've tinkered with the engine about. I guess I'll get a new MC and flush the system and see if that helps. __________________ It's not that I am apathetic, I just don't care. If your life is a joke, it appears death will be your punchline.



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