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Old 05-31-2013, 11:19 AM
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Brake pedal won't return

Hi I'm new here but thought I could get some great advice here. I have a 55 chevy truck 2nd edition. My problem is with the brake system and is driving my insane. I installed a CPP brake booster/master cylinder combo under the floor. I also replaced the calipers, wheel cylinders, and brake lines (hard and rubber). The problem is after I bled the brakes the pedal was firm and felt great. After starting the truck and mashing the pedal it stays down and won't return. The brakes on the front still hold until I pull the pedal back with my foot. I put a spring on the pedal but it still does the same thing. Any suggestion to what causes this?

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Old 05-31-2013, 12:56 PM
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I have the same basic setup on my truck and it works well. Did you use residual pressure valves? Are they the correct psi rating for the brake type?
You have to identify where the problem is, then you can fix it. Loosely bolt pedal to master cyl rod. depress pedal. If it sticks, unbolt pedal. Did pedal rise and mc stay compressed? If so, pedal is OK. With mc stuck compressed, loosen the brake lines one at a time to the master cyl. When the cylinder returns, you found the line with the problem. Tighten up the line and rebleed it. Now go down the line and check the residual valves, and wheel cylinders or calipers the same way. Opening each one until you find the one that holds the cylinder compressed.
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Old 05-31-2013, 08:39 PM
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I used residual valves. I put a 2 psi one on the front disc and a 10 psi one on the drums.
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