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Elrich11
Re: Brake Bias
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Quote:

Murvz wrote:
I am running R31 rears and 280mm s13's on the front along with a 7/8th master with booster and wilwood proportinoning valve on my 1200 ute also.
Should have it back on the road next week for testing. I'll keep you posted how it fairs for comparison

Awesome Murvz, I would be keen to hear how you go with it.

Posted on: 2017/3/3 0:56
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Elrich11
Re: Brake Bias
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Fitted the SR20DET single piston calipers and 280mm rotors. I now have the bias under control and have much better feel and braking power. I was surprised at the improvement this change made!

Posted on: 2017/3/12 7:22
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ddgonzal
Re: Brake Bias
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Good to know. So it seems that the R31 rear brakes are too big to go with the S13 250mm front brakes

Posted on: 2017/3/12 7:32
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Elrich11
Re: Brake Bias
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ddgonzal wrote:
Good to know. So it seems that the R31 rear brakes are too big to go with the S13 250mm front brakes

Yeah, at least in a ute anyway. It might work in a different body type with more weight at the back?

Posted on: 2017/3/12 7:34
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Murvz
Re: Brake Bias
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Hey Elrich. Finally got to road test my setup. Bias seems ok even with no proportion adjustment. I have found that my peddle is really spongey now compared to the old setup. How does yours feel? I am running a brake booster also.

Posted on: 2017/3/27 2:34
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Elrich11
Re: Brake Bias
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Quote:

Murvz wrote:
Hey Elrich. Finally got to road test my setup. Bias seems ok even with no proportion adjustment. I have found that my peddle is really spongey now compared to the old setup. How does yours feel? I am running a brake booster also.

Hi Murvz, my pedal feels fine. I'm running the Maddat booster and 7/8" master.

Posted on: 2017/3/27 3:29
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ddgonzal
Re: Brake Bias
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Compared to a non-booster setup, the booster type will allows feel spongier. Even so, when the brake system is bled properly a booster type will feel fine

One simple test you can do is: With engine off, pump the brakes until the booster loses vacuum. The pedal should get higher and tighter with each pump. All sponginess should go away after four pumps or so -- which indicates the brake hydraulics are OK. If it doesn't remove all sponginess, re-bleed the brakes

Posted on: 2017/3/27 5:37
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Murvz
Re: Brake Bias
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The pedal is quite firm without the engine running so I'm not too worried.. I may still try another bleed just to be sure. The car is pulling up fine. I think the difference is just due to the SR calipers being quite a bit larger than the bluebird calipers I previously had fitted.

Posted on: 2017/3/27 11:20
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ddgonzal
Re: Brake Bias
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With the larger calipers it will require more pedal travel. You can shorten the pedal travel by fitting a larger diameter master (the downside is more foot pressure is required, but with a booster that's not usually a problem). Also if you have rear drum brakes, adjust them to spec as this reduces pedal travel

"Sponginess" technically refers to a mushy pedal due to air in the lines. A lot of people call increased travel "spongy" but it's actually a different thing and a different feel

Posted on: 2017/3/28 6:01
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Murvz
Re: Brake Bias
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One of my double flares was questionable. Created a small leak and was letting air in the system. Bled it off and the pedal feels much better now. Past rego this morning so shes back on the road!!

Posted on: 2017/3/28 7:48
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