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Mod | | | Forums66 Topics128,154 Posts1,056,835 Members48,456 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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| | | | Joined: Feb 2004 Posts: 29,850 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,850 | I don't see one in the stock setup Look at items 11 and 12 in the master cylinder cutaway. That's a built-in residual valve that keeps about 10 PSI pressure in the brake lines to avoid drawing air past the wheel cylinder cups. The tension of the brake shoe return springs keep the brakes from dragging the drums. Disc brakes can only tolerate abour 2 PSI of residual pressure because there are no return springs for the caliper pistons and the pistons are much larger diameter than drum brake wheel cylinders- - - -more push on the brake pads per PSI of line pressure. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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