Nismo280zEd Posted December 9, 2005 Share Posted December 9, 2005 So the front of the car takes the hydraulic line from the master cylinder then goes into a proportioning/splitter valve that is supposed to evenly distribute forces to the left and right side of the vehicle, well mine is putting most of it to the right(passenger) side of my car. A new one cost 230 bucks, so i'm wondering if i could use and adjustable bias valve inline? (60 bucks) to control left and right? or am I better off just junkyarding the part? -Ed BTW if you have a working one i'll buy it from you Quote Link to comment Share on other sites More sharing options...
mark Posted December 9, 2005 Share Posted December 9, 2005 I think that part is just a T. I would look at your calipers first. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted December 9, 2005 Share Posted December 9, 2005 Mark's right. The proportioning valve only controls balance front and rear. The front calipers fittings are fed from a common chamber in the PV. Look for damaged lines, hoses (possibly collapsed internally) and sticking calipers. If the caliper is sticking the pads will be worn significantly different from one side and the other (drivers side/ pass side) or you'll see only the pad for the piston worn heavily while the outside pad is barely thinned. Also, a misalignment or worn steering component canl be more pronounced in braking situations. Quote Link to comment Share on other sites More sharing options...
Guest 73TPIZ Posted December 10, 2005 Share Posted December 10, 2005 Mark's right. The proportioning valve only controls balance front and rear. The front calipers fittings are fed from a common chamber in the PV. Look for damaged lines, hoses (possibly collapsed internally) and sticking calipers. If the caliper is sticking the pads will be worn significantly different from one side and the other (drivers side/ pass side) or you'll see only the pad for the piston worn heavily while the outside pad is barely thinned. Also, a misalignment or worn steering component canl be more pronounced in braking situations. Good advice. My GMC Seirra was pulling hard to the left so i replaced both calipers and pads but that didn't fix it. A guy told me to replace the hoses and that did the trick. Good luck with it. Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted December 10, 2005 Author Share Posted December 10, 2005 the car has new master cylinder, brake booster, lines, and SS lines to the calipers which also are relatively new (3 yrs old) They both blead off the same though, so I wouldn't think its the caliper? If the piece is just a T then i'll go pick up a fitting from swadgelock and solve that problem right there. I was thinking it was a valve for some reason, I'll have to look at it again. My car doesn't get driven enough to show significant pad wear. The only thing you can tell is more brake dust on the passenger than the driver front wheel only. I'll see if the local auto store has a caliper in stock, if that's not it i'll just bring it back to them. -Ed Quote Link to comment Share on other sites More sharing options...
johnc Posted December 10, 2005 Share Posted December 10, 2005 That valve assembly under master cylinder is called a Brake Line Pressure Differential Warning Switch. Its there to warn the dirver via a dash warning light when the brake pressure difference between the front and rear brakes exceeds about 200psi. It is just a warning switch and does not affect brake balance. Quote Link to comment Share on other sites More sharing options...
jt1 Posted December 10, 2005 Share Posted December 10, 2005 More brake dust on one side is a giveaway. There's a good possibility that the side with more dust has a sticking piston in the caliper, or the side with less dust has some air in it. jt Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted December 11, 2005 Author Share Posted December 11, 2005 I'm not talking about the warning switch. I run an 83zx booster and master cylinder in my 78 280. -Ed Yes i realize brake dust on one side and not the other is a dead giveaway, but that does not tell me the source of the problem, just that one wheel is using more pad than the other, I checked the calipers today, that's not the problem. Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted December 16, 2005 Author Share Posted December 16, 2005 took everything apart the last two days. wonderful MSA sent me the wrong damn wheel bearings. Cleaned mine and inspected them, they look excellent still, repaked them, got the rotors turned, put rotor and hub back on, manually pushed each piston back on the calipers, so i know they aren't sticking. Put new hawk pads in, bleed the front brakes. No squeal and no brake pull, however doesn't stop that well either. I'll check the rear drums this weekend hopefully. -Ed Quote Link to comment Share on other sites More sharing options...
Mayolives Posted December 16, 2005 Share Posted December 16, 2005 I will agree with JT1's reply based on my experience with wilwood calipers that had "stuck" pistons. I dissembled them and cleaned the cylinders. Then all was well. Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted December 23, 2005 Author Share Posted December 23, 2005 well the front brakes seeming to be wearing in just fine, equal dust and no pull to one side. I think the caliper on the driver side had frozen up a lil when my car sat while i was in Florida. Either way everything seems to work now and they grab nicely. -Ed Quote Link to comment Share on other sites More sharing options...
wal280z Posted December 24, 2005 Share Posted December 24, 2005 Glad to see you got it fixed. My problem was that the "T" was clogged. I took a spare valve apart and found the valve full of debris (no wonder it was on a totalled Z in the JY)[edit: debris = caked crud]. If you are like me (and have S*** laying all over the place) don't attempt this w/o a spare or ready to dish out the extra $$. Don't know if this was the problem as I havent' gotten the goat out of the garage yet. But, at least it's clean, right (will I ever get this one on the track?) Wayne Quote Link to comment Share on other sites More sharing options...
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