wilwood brake problem
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
wilwood brake problem
I installed wilwood d-8 forged calipers master cyl, bias valve. I have bleed at least $$150.00 worth of wilwood brake fluid in this thing and when using this car @ Elkhart Lake I can go about 2 laps and when I come off the long straight away and apply the brakes the pedal is @ 50%. I've bench bled this master countless times and gone around all the wheels and let sit for a day and pedal starts out great and then goes south under heavy braking (also using Hawk pads) Anyone else experience this? I have talked to Wilwood and they have been very good @ trying to remedy this but problem still persists. If anyone has had this problem in a roadrace application,any help would be appreciated Not ranting,just want this problem rectified 
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Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
it is crap sometimes,I did an auto cross crap braking every time park the car pump the pedal comes right up stays there until turn 2 or turn 3 then half way to twothirds down .Not very trustworthy.
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
It is not pad fade, pedal height varies down to just off the floor to maybe halfway requiring 2 to 3 pumps to get braking .Nerve racking when you are trying to slow from well fast. Thanks tr
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
maybe wont need brakes. tr
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
Great minds think alike. The next reply , installing residual check valves might be the ticket.thanks.tr
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
Whether or not you have runout, you will still have some piston knockback in corners due to bearing play and spindle flex. A long time ago a racer gave me a tip to use the wilwood 2 psi residual pressure valve. That holds 2 psi pressure on the caliper at all times to minimize knockback. Its the blue hexagonal valve.
http://www.wilwood.com/MasterCylinde...derValves.aspx
http://www.wilwood.com/MasterCylinde...derValves.aspx
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
thanks for the bleeder tip.I even went as far as changing the castle nuts front spindles to elimanate the play. thankstr need to check with wilwood for 1/4in line check valves, part #s I first looked up were for 3/16 lines.
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
I checked wilwood site they only offer 3/16 line size valves and until you get to the tees the line size from the master is 1/4 ". I think the reduction to 3/16 would hampper the proper volumn reaching the caliphers. Which brings up the question of where to mount the valves. The wilwood caliphers that I have ,have the inlrt port in the middle on the inside with offset trailing arms the upward suspension travel ,the rubber stop ,the clearance is 1/8" not allowing for anything larger in diameter than the hose. In the front driver side tee to hose mount the steel line is only 3" with a 90 degree bend then the flex line to calipher. So now for my stupid question where do the valves get installed? at a loss. thanks tr
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
Bored, thought I'd look at some of my old threads and I see that I never passed on the info that corrected this problem. 'Rodeck350+ gave me the idea of splindle flex being the problem. After some research the realization [ the Ford light bulb came on] mine is a 6t8 -A SMALL SPINDLE- same as the 65 to 67, 69 and up got larger spindles hubs. So there is the solution, start pricing parts -ouch. Just so happens 1 day I'm checking out the Chicago Craig list of corvette parts and someone is selling some front rotors from a 1975. Open up the add and the spindles and hubs are connected to the rotors for $45. How could I go wrong. Installed them a few days later. Got used to the trustworthy braking at the Milw Mile with the SCCA. Next summer at R/A had my best times, just over 2min 38 secs. Now just to give some perspective to the issue the track record, I think the drivers name was Franchiti and his time was just over 1min, 21secs on a 4.08 mile track with 14 corners in an Indy car. That's averaging over a 120mph, and I thought I was going fast in my 6t8. T
Pro
Joined: Aug 2001
Posts: 711
Likes: 54
From: Boston MA
Bored, thought I'd look at some of my old threads and I see that I never passed on the info that corrected this problem. 'Rodeck350+ gave me the idea of splindle flex being the problem. After some research the realization [ the Ford light bulb came on] mine is a 6t8 -A SMALL SPINDLE- same as the 65 to 67, 69 and up got larger spindles hubs. So there is the solution, start pricing parts -ouch. Just so happens 1 day I'm checking out the Chicago Craig list of corvette parts and someone is selling some front rotors from a 1975. Open up the add and the spindles and hubs are connected to the rotors for $45. How could I go wrong. Installed them a few days later. Got used to the trustworthy braking at the Milw Mile with the SCCA. Next summer at R/A had my best times, just over 2min 38 secs. Now just to give some perspective to the issue the track record, I think the drivers name was Franchiti and his time was just over 1min, 21secs on a 4.08 mile track with 14 corners in an Indy car. That's averaging over a 120mph, and I thought I was going fast in my 6t8. T
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
Thanks for the correction, still very fast compared to me in my C3. Did I even get the drivers name right? T