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4 lug and 5 lug proportioning valve diff.

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Old 03-29-06, 12:28 PM
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4 lug and 5 lug proportioning valve diff.

what are the phisical diffrences between the 2? i did the 5 lug swap a whie back and i have been having problems with the rear locking up but never the fronts. hardly feels like the fronts grab. any one who has any idea on that? only thing i can think is the proportioning valve.
Old 03-29-06, 12:30 PM
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did you uprgrade the brake to 4 pots at the same time?
what about the rears, were they upgraded as well?
Old 03-29-06, 01:29 PM
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ya all 4 corrners were upgraded with re-man calipers all arround. i just noticed that i have a slight fluid level drop. filled up the mc about 3 weeks ago and its down to about 1/2 fluid now. but there is no odvious leaks could it be inside one of the calipers?
Old 03-29-06, 07:56 PM
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ok had another thought. could it be that the calipers were not seated properly from the get go?
Old 03-30-06, 10:39 AM
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I swapped to 4 pot brakes with the 4 lug prop valve without issue. I did change the master cylinder when I did the swap.

My fronts lock before the backs slightly, though it's an issue with the master (new one in the mail), so I doubt that is your issue. Are you sure the fronts are completely bled out?

Your master could also have a bad seal on the front brake portion.
Old 03-30-06, 02:25 PM
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humm. just put in a new master cyl. i dunno i think i might have a small leak in one of the front calipers. letting air into the system and a little fluid out but not enough to notice without checking fluid level. i will try bleeding the brakes again to see what happens. got to call up a friend.
Old 03-30-06, 08:17 PM
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Did you use a Master Cylinders from a 5-lug car (with 4-pot brakes)?

The proportioning valves are the same for 4 and 5 lug cars. The Master Cylinders are not.
Old 04-01-06, 07:37 PM
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yep swaped the master cyl too. i dont know if this might matter but i got "unloded" claipers whatever that means
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