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#1 |
Registered User
Join Date: Jul 2011
Location: sutton WV
Posts: 1,822
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"NEW" Wilwood master cylinder (no brakes)
I just installed a new Wilwood master cylinder and brake booster on my truck, after bench bleeding and the normal brake bleeding for 2 hours the pedal still goes to the floor!!!! Everything worked fine with the CPP booster I took off, anybody have any suggestions.
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Jason '70 C-10 short fleet 427BB TH400 (SOLD) '10 Ford F 350 '13 Ford RAPTOR 6.2 MY BUILD THREAD http://www.67-72chevytrucks.com/vboa...d.php?t=612623 |
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#2 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: "NEW" Wilwood master cylinder (no brakes)
Gotta be something basic, or possibly a defective master, but more likely air.
Are the calipers mounted with the bleed screws on the top? They can't be bled with them mounted such that the bleeders are on the bottom. Note that with discs I found the first stroke or two of the pedal DID go to the floor until the pistons were full, then subsequent strokes were all high and hard. So if you only hit the pedal once, try it again... Sorry, not much meat here, someone else should be along with more ideas soon!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#3 | |
Registered User
Join Date: Jul 2011
Location: sutton WV
Posts: 1,822
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Re: "NEW" Wilwood master cylinder (no brakes)
Quote:
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Jason '70 C-10 short fleet 427BB TH400 (SOLD) '10 Ford F 350 '13 Ford RAPTOR 6.2 MY BUILD THREAD http://www.67-72chevytrucks.com/vboa...d.php?t=612623 |
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#4 |
Registered User
Join Date: Jun 2016
Location: Vancouver B.C.
Posts: 206
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Re: "NEW" Wilwood master cylinder (no brakes)
If I read it right, you changed the booster as well as the master cylinder. Is it possible that the pushrod in the booster is adjusted too short? If so, you won't get full travel of the master even though the pedal goes to the floor.
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#5 |
Registered User
Join Date: Jul 2011
Location: sutton WV
Posts: 1,822
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Re: "NEW" Wilwood master cylinder (no brakes)
That makes sense, I look into that. Thanks
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Jason '70 C-10 short fleet 427BB TH400 (SOLD) '10 Ford F 350 '13 Ford RAPTOR 6.2 MY BUILD THREAD http://www.67-72chevytrucks.com/vboa...d.php?t=612623 |
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#6 |
Registered User
Join Date: Jul 2011
Location: sutton WV
Posts: 1,822
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Re: "NEW" Wilwood master cylinder (no brakes)
I didn't spend much time checking into it today, but I did pull the master cylinder off and had my wife push the brake pedal to the floor. It looks like the rod in the booster only travels about 3/4" out. I don't know how much it should move but that don't seem like it's enough.
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Jason '70 C-10 short fleet 427BB TH400 (SOLD) '10 Ford F 350 '13 Ford RAPTOR 6.2 MY BUILD THREAD http://www.67-72chevytrucks.com/vboa...d.php?t=612623 |
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#7 |
Registered User
Join Date: Jul 2007
Location: hancock maryland
Posts: 12
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Re: "NEW" Wilwood master cylinder (no brakes)
thats not enough travel do you have the bushing installed in the end of the master for the pushrod to ride on?
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#8 |
Registered User
Join Date: Jul 2016
Location: Elkhart, Indiana
Posts: 292
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Re: "NEW" Wilwood master cylinder (no brakes)
One other thing to check, I see you have a adjustable prop valve. I've ran into issues with not having that set up right and causing issues while bleeding brakes. I know not much help but its something I've ran into.
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1967 Chevy C20 to K20 Conversion "Simply Toxic" http://67-72chevytrucks.com/vboard/s...d.php?t=749409 1971 Chevy C20 Custom Camper LS Swap http://67-72chevytrucks.com/vboard/s...d.php?t=763775 |
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#9 |
Registered User
Join Date: Jul 2012
Location: Jonestown, TX
Posts: 471
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Re: "NEW" Wilwood master cylinder (no brakes)
I'm signing on to see the outcome of this, I'm having a similar issue with a different mfr's booster/master. I'm frustrated enough that I had wished I bought the Wilwood. Reality is that I've likely looked over or missed something. I tried adjusting pushrod length but no luck. Keep us updated Jason, I'd like to know how this turns out...
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#10 | |||
Registered User
Join Date: Jul 2011
Location: sutton WV
Posts: 1,822
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Re: "NEW" Wilwood master cylinder (no brakes)
Quote:
Quote:
Quote:
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Jason '70 C-10 short fleet 427BB TH400 (SOLD) '10 Ford F 350 '13 Ford RAPTOR 6.2 MY BUILD THREAD http://www.67-72chevytrucks.com/vboa...d.php?t=612623 Last edited by jeh; 09-19-2016 at 01:28 PM. Reason: Spelling |
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