nissanthanh, on 03 Nov 2014 - 9:27 PM, said:nissanthanh, on 03 Nov 2014 - 9:27 PM, said:nissanthanh, on 03 Nov 2014 - 9:27 PM, said:
Hello all. I just picked up a full brake upgrade set up from a guy on craigslist. s12w fronts, maxima rears, hawk pads all around. I was curious about the brake bias issue. Should I get a proportioning valve? Specifically for the maxima '88 I believe? Everything I got was brand new, came with new pads and rotors and master cylinder from 280zx.
Suggest that you spend several days researching "brake bias" and brake upgrade issues on HybridZ. All of the anwers are here concerning brake bias and proportioning valves.
The Toyota S12w front and Maxima rear setup is highly biased towards the front. That being the case, a proportioning valve, which only installs on the rear brakes, will reduce pressure to the rear brakes making the front-rear bias issue worse. In other words, braking performance will not be improved with this so called upgrade.
And a proportioning valve on the front brakes is dangerous.
You can waste a lot of money trying to correct the bias issue experimenting with pad combinations.
Note that most street "performance pads" such as Hawk have poor cold bite which is what you don't want when the guy in front of slams on his brakes. Do a Google search "Hawk pads cold bite" and for other pads etc.
Well maintained stock brakes are fine.
By the way, the rear axle shafts were designed to work with drum brakes. If the wheel mounting flange of the axle shaft is warped it will cause the pads to drag on any disk upgrade. Recommend that you check the runout on your flanges before installing any rear disk brake setup. The flanges can be turned up to a point to correct the warp. Rear wheel bearing issues can also cause pads to rub on the disk. If you do the rear disk swap replace the wheel bearings at the same time and reassemble the stub axle per the Factory Service Manual (FSM).
Edited by Miles, 05 November 2014 - 10:36 PM.