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Author Topic: Brake line PSI ???  (Read 1131 times)

Screaming Bear

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  • Location: Dayton, Nv
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Brake line PSI ???
« on: January 24, 2013, 08:36:26 AM »

I am suspecting I have poor rear braking on my RV. 79 P30 Chevy chassis with a hydro boost system. Has anyone ever tested brake line pressure with a gauge? The only spec I can come up with is a proportioning valve will limit 500-600 PSI to rear.  I didn't even see a proportioning valve! I flushed the power steering fluid yesterday hoping this might improve the hydro boost if it was gummed up. Steering feels nice and light so I don't think the problem is the P/S pump. I am replacing the old rear flex line hoping it may be restricting flow and I will test the line pressure. (brakes are all new, the fronts are doing all the work) Anyone work on trucks? Is 500 PSI what I am looking for?
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51 CJ3-A, 4.3 TBI Chevy, SM420, Dana 18TC, 30/44 Full Floaters, Yukon Front Axle and Hubs, rear drive flanges, Detroit Fr / E-Locker Rr, 4.27:1 Gears, 74:1, HD steering / 4 wheel disk brakes, Viair 550C, 100% LED - VisionX headlights, Rigid Light-bar, DOT Fogs, Grote tail, Soft Top and Heater, 35"KM-2's, 3" up, no articulation - it works

timatoe

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Re: Brake line PSI ???
« Reply #1 on: January 24, 2013, 11:41:17 AM »

Don't know about the PSI etc. but I have heard of soft lines collapsing over time causing poor braking.
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Screaming Bear

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Re: Brake line PSI ???
« Reply #2 on: January 24, 2013, 12:27:33 PM »

Don't know about the PSI etc. but I have heard of soft lines collapsing over time causing poor braking.
Yes that's what I am hoping. I have the rear hose and I ordered a new M/C for the hell of it. The front disk brakes seem to be doing all the work. I am toasting even the ceramic pads. Calipers are not sticking. 13 x 3 1/2" rear drums should be decent stopping power. It has to have a proportioning valve somewhere. It could be bad.
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51 CJ3-A, 4.3 TBI Chevy, SM420, Dana 18TC, 30/44 Full Floaters, Yukon Front Axle and Hubs, rear drive flanges, Detroit Fr / E-Locker Rr, 4.27:1 Gears, 74:1, HD steering / 4 wheel disk brakes, Viair 550C, 100% LED - VisionX headlights, Rigid Light-bar, DOT Fogs, Grote tail, Soft Top and Heater, 35"KM-2's, 3" up, no articulation - it works