help with wilwood breaks, can't get the combo right.
#131643
10/03/08 04:01 PM
10/03/08 04:01 PM
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Joined: May 2007
Posts: 141 Milwaukee, WI
joflaig
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Milwaukee, WI
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The resto shop put in a 4 way Wilwood disc setup on my Charger, but after a huge amount of experimentation that just can't seem to get them working right and now they're hearing from their vendor to maybe switch to manual instead of power. They have tried 4 different boosters. The setup right now is 4 piston front discs and 2 piston rear discs, with an OEM master cylendar, hemi-booster, 1" bore.
I have not tried it myself, but they say the problem is the pedal pressure, there is initial pressure, which then drops an inch and I guess when the pedal is on the floor it's stiff with no movement, though the breaks do engage, in fact so much the engine can stall. All the breaks lines are new and they've bled it to death.
Anyone have this combo working?
Last edited by joflaig; 10/03/08 04:11 PM.
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Re: help with wilwood breaks, can't get the combo right.
[Re: BergmanAutoCraft]
#131646
10/03/08 04:27 PM
10/03/08 04:27 PM
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Joined: May 2007
Posts: 141 Milwaukee, WI
joflaig
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Quote:
Just went through this on a customer car. The solution - Hyrdroboost!
Yeah, we already added a vacuum boost as I was only getting 9" or so and Wilwood said we need 19" or so -- unless what you are refering to is something different.
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Re: help with wilwood breaks, can't get the combo right.
[Re: BergmanAutoCraft]
#131648
10/03/08 05:56 PM
10/03/08 05:56 PM
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Joined: May 2007
Posts: 141 Milwaukee, WI
joflaig
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Quote:
Hydroboost is a hydraulic assist setup that runs off the power steering pump. This has been used on many domestic cars and trucks as an OE piece for years. It allows you to generate WAY more line pressure than ever possible even with a vacuum booster under any circumstances. We sell them here at XV for 875, which includes the line kit and a master cylinder. Forget about the vacuum, and the manual options. IMHO they aren't options...
Hmm, that seems crazy that it's not possible to run 4x discs without this, even with a vacuum pump.
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Re: help with wilwood breaks, can't get the combo right.
[Re: joflaig]
#131649
10/03/08 06:07 PM
10/03/08 06:07 PM
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Joined: Jan 2003
Posts: 25,951 Rio Linda, CA
John_Kunkel
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Rio Linda, CA
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It's possible that the calipers require more fluid volume than the 1" MC can provide, this would explain the low pedal.
What is the pedal ratio?
The INTERNET, the MISinformation superhighway
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Re: help with wilwood breaks, can't get the combo right.
[Re: joflaig]
#131650
10/03/08 10:08 PM
10/03/08 10:08 PM
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Joined: Sep 2005
Posts: 6,516 Santa Cruz, California
Lefty
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Quote:
What type or perportioning valve are you using
You don't need a valve on 4 wheel discs.
I suspect John is right about the MC running out of fluid or the MC is bad and dumping pressure past the piston.
I have 4 wheel discs with the Wilwood 4 piston calipers in front and a 6-1 pedal ratio. I'm running a 7/8" piston Wilwood MC and the brakes are great. I like manual brakes because they are always there and the pedal feel is always the same even with the engine off.
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Re: help with wilwood breaks, can't get the combo right
[Re: cogen80]
#131652
10/04/08 10:13 AM
10/04/08 10:13 AM
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Joined: Jan 2003
Posts: 1,379 Houston,Tx.
Lee446
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Houston,Tx.
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I am no brake expert by any means, but, how do big brake, multi-piston cars like Vipers and Vettes manage to work with regular vac boosters? And if a vac pump is not enough, why would a manual system not work? There is something going on here that does not make sense and it sounds like a mechanical defect, ie; bad M/C or wrong or plugged distribution/proportioning valve.
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