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06-04-2012, 03:01 AM
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#1 |
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Join Date: Jul 2008
Location: on the island state
Age: 38
Posts: 5
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Front Brakes locking up after 300zx BMC install
Ok, see if u can help me with this BMC problem.
Specs: 92 240sx non-abs coupe Front 300zx 95 N/A calipers and 5 lug w/ new stainless lines stock BMC (everything worked fine) Did: Rear 300zx ebrake/5 lug/caliper upgrade (same 95 N/A) 300zx 17/16 BMC (was bench bled prior to install, no bubbles) .... NOW: Front Calipers locking up after car warms up to operating temp notes: - problem resolves when car cools - front calipers lock up slowly over time (and ONLY the fronts) - pedal feel stays the same - no leaks anywhere re-bled the system and heavily re-bled both fronts. - ran car, problem persisted changed back to stock 240sx BMC - problem resolves WTF Ok, so 300zx BMC is the problem, but whats up? - brake booster rod too long? (tried adjusting rod 180 degrees clockwise, didnt work) - semi-plugged middle fitting? - What else would cause fluid not to return to master?  |
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06-04-2012, 09:36 PM
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#2 | |
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Zilvia Addict
 Join Date: May 2008
Location: Missouri City, TX
Age: 38
Posts: 997
Trader Rating: (2)
Feedback Score: 2 reviews
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Quote:
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06-05-2012, 05:01 PM
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#5 |
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Premium Member
 
Join Date: Sep 2006
Location: Bremerton, WA
Age: 36
Posts: 2,037
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if its the bmc, i suggest rebuilding it rather than buying a new one
OEM Brake master cylinder rebuild kit (Nabco 17/16")
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formerly known as "hotboiblaze"  ratsun: dawa (73 datsun 620) clublexus: properD (97 sc300) |
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06-05-2012, 05:07 PM
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#6 |
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Zilvia Member
 
Join Date: Jul 2009
Location: Pittsburgh, PA
Age: 33
Posts: 177
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had this issue before with a chevelle. make sure your brake lines are away from any heat. what happened with the chevelle the brake lines got too close to the headers and would boil the brake fluid which caused it to pressurize, then it would lock up when it cooled down could you use the brakes til they got hot again.
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90 Hatch- Current Daily/Project I Need Interior Pieces Pm Me |
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06-05-2012, 05:08 PM
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#7 |
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Premium Member
Join Date: Sep 2006
Location: Bremerton, WA
Age: 36
Posts: 2,037
Trader Rating: (23)
Feedback Score: 23 reviews
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^ thats what i was thinkin... well more along the lines that trapped air was being heated up. but still, heat and/or air = bad
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formerly known as "hotboiblaze" ratsun: dawa (73 datsun 620) clublexus: properD (97 sc300) |
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06-05-2012, 08:31 PM
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#8 |
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Post Whore!
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Does this happen when you are cruising? Is your car boosted? The one way check valve could be bad on your booster.
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My SR20VET |
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06-05-2012, 10:49 PM
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#9 |
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Post Whore!
Join Date: Dec 2004
Location: Poconos, PA
Age: 36
Posts: 8,030
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 Feedback Score: 58 reviews
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Did you follow the FSM bleeding procedure? Typically with Z master cylidners the rears lock first.
With that said, are the fronts locking with casual brake application or under hard brake application?
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