Testing brake proportioning valve please?
Thread Starter
Cruising
Joined: Apr 2012
Posts: 14
Likes: 0
From: Omaha NE
Testing brake proportioning valve please?
My 68 is almost road ready. I do not know what year it was last driven. The master cylinder cap was gone and it needs replaced because it is rusty inside.
Thought I would buy a master cylinder and power booster combo. The water and rust did not get to the brake proportioning valve so I think because, the output of the Master Cylinder and the input of the valve have no rust. And there is brake fluid dripping from the master cylider output.
Can I test this valve before I drive it? I know what it is suppose to do when driving but I haven't driven it yet. I haven't removed the output lines of the proportioning valve to see if I can move the valves freely. Is that what I do or should I just replace it? I can't believe the thing cost $80.00 Can I get new internal parts? I can't find them.
Thought I would buy a master cylinder and power booster combo. The water and rust did not get to the brake proportioning valve so I think because, the output of the Master Cylinder and the input of the valve have no rust. And there is brake fluid dripping from the master cylider output.
Can I test this valve before I drive it? I know what it is suppose to do when driving but I haven't driven it yet. I haven't removed the output lines of the proportioning valve to see if I can move the valves freely. Is that what I do or should I just replace it? I can't believe the thing cost $80.00 Can I get new internal parts? I can't find them.
Last edited by RelativeEarth; Nov 5, 2012 at 04:02 AM.
Le Mans Master
Joined: Aug 2010
Posts: 5,339
Likes: 546
From: Central Texas
I don't believe there is a test for the valve. I do know that you cant buy parts for them. They are replaced as an assembly. If you had rusty internals in your master cylinder I would change it anyway. Cheap enough for peace of mind and safety.
Melting Slicks
Joined: May 2009
Posts: 3,079
Likes: 314
2024 C3 of the Year Finalist - Unmodified
Trouble is, it is not a proportioning valve. It is only a switch that is used to detect an imbalance in pressure between the front and rear brake systems, which will illuminate the BRAKE warning light on the dash...the same warning light that comes on when the parking brake handle is raised.
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Melting Slicks
Joined: May 2009
Posts: 3,079
Likes: 314
2024 C3 of the Year Finalist - Unmodified
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Thread Starter
Cruising
Joined: Apr 2012
Posts: 14
Likes: 0
From: Omaha NE
I realize it ain't no Rambler, but does this help?
http://theamcpages.com/brakes_press_diff.html
Wow! This is the perfect explanation I could ask for. Thank you Faster Rat, this forum is awesome!
http://theamcpages.com/brakes_press_diff.html
Wow! This is the perfect explanation I could ask for. Thank you Faster Rat, this forum is awesome!