Pedal travel upon initial application
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Tuned
Joined: Feb 2017
Posts: 490
Likes: 33
From: Winnipeg
Pedal travel upon initial application
Hey folks, I have a 56 F100 with the CPP frame mounted booster/master cylinder. I plumbed in the residual check valves 10lb for rear drums and 2lb for front discs. My question is... Is it normal for the pedal to travel close to the floor on initial application (truck has sat for a least a week) then stayed pumped up after the initial application. So do these residual check valves normally bleed down slowly?
Logistics Pro
Joined: Jul 2016
Posts: 3,650
Likes: 816
From: Swan River Valley M.B Can
Even if they do bleed down you shouldn't have that much travel . My guess is your rear shoes are out of adjustment and taking up the initial pedal travel and then your residual valve does its job .
Elder User
Joined: Apr 2016
Posts: 645
Likes: 10
Like others mentioned, behaves like there is air trapped in the system. Rear drum brakes out of adjustment would cause low pedal all the time. A bad dual reservoir master cylinder also behaves in a similar manner. I'd first bleed the system again.
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