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04-20-2008, 01:00 AM | #1 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,856
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Disc brake proportioning valve question
I got alot done today on my truck but ran into a snag at the end of the day I got a front end alignment done first thing in the morning and headed up to 70GMCers house to put on new rear wheel cylinders, brake shoes, and rear brake lines. We took off the rear line on the prop valve and blew compressed air thru the line to the rear and cleared out the crud!. Then when trying to bleed the rear wheel cylinder I heard a pop in the prop valve and could tell it became "uncentered" and turned the warning lamp on. We tried to clamp it with a C-clamp but it didn't work and also took it for a drive to slam on the brakes to try to recenter it but no luck. The valve has been perfect until we were bleeding the rear and it popped. Is there any other way to recenter it before I buy another valve????
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
04-20-2008, 01:06 AM | #2 |
Step Brother
Join Date: Sep 2007
Location: K-town
Posts: 4,029
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Re: Disc brake proportioning valve question
Just get in the truck and stomp the pedal Hard with the key on to see if you got it to go out...That's what fixed mine...Good luck...
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04-20-2008, 01:16 AM | #3 |
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Re: Disc brake proportioning valve question
George, when I did my disc brake conversion last year that trick worked perfect but this time it won't recenter when I try to slam on the brakes.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
04-20-2008, 02:02 AM | #4 |
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Re: Disc brake proportioning valve question
Update! after talking to Cyclone44 I realized I was supposed to stomp on the pedal while the truck was parked I just went out and stomped it one time and the light went out! Now I just have to bleed the rears and I should be golden!. Thanks George and thanks again to Steve for all your help today! Hopefully I can take the truck to the Maryland cookout next Sunday!
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
04-20-2008, 02:09 AM | #5 |
Step Brother
Join Date: Sep 2007
Location: K-town
Posts: 4,029
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Re: Disc brake proportioning valve question
Good to talk to you Jim and I'm glad it worked for you...If you need any help with that one man bleeder just give me a call.....
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04-20-2008, 02:13 AM | #6 |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Disc brake proportioning valve question
A lot of times all you have to do is "balance" the pressure by opening a bleeder on the front.
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04-20-2008, 04:47 AM | #7 |
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Re: Disc brake proportioning valve question
Longhair- thanks for the tip!
George- I rented the super nice bleeder kit thinking I could do it but I can't figure it out. This kit is brand new. The clear tubing is a little too big for the bleeder so I used one of the supplied reducers and added a smaller diameter hose but it still wouldn't pull any fluid when I cracked the bleeder.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
04-21-2008, 04:56 AM | #8 | |
Step Brother
Join Date: Sep 2007
Location: K-town
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Re: Disc brake proportioning valve question
Quote:
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04-21-2008, 06:28 AM | #9 |
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Join Date: Feb 2002
Location: The TAX State!
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Re: Disc brake proportioning valve question
Thanks George, my wife and I were out when you called and I didn't get your message until late this evening. I tried the gravity bleed method and then gave it a few easy pumps but didn't get a chance to road test it to see how it feels. The hose from the one man kit kept popping off the bleeder so I gave up on it and plan to take it back in the morning. The next thing I have to fix is a leak at the union on the axle. It's probably something simple. I tightened the new line as tight as possible- maybe too tight!
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads Last edited by 70c10; 04-21-2008 at 06:28 AM. |
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