Brake balance

[Kas]

I have a problem with brakes on my Hachi.

As you know, I was made a swap from SR 5 to GT, and I change every thing including replacing rear braked from drums to discs and changing brake balancer ( part under master cilinder).

SR 5 got ventilated discs on front, same as GT so I didnt change anything but brake pads.

On rear, I bought new discs, brake pads, and rebuild calipers.

I also change brake oil and front brake rubber pipes.

Car is braking good, BUT problem is that after ride, my rear wheels are hot ( including brakes ) and my front wheels jus a little warm.

That means that rear brakes are working too much and front too little.

I know that front discs are ventilated, but brake force must be delivered proportionaly to brake force ( example 70-80 % on front and 20-30 % on rear ).

I didn't drive car on track, but I think that I might have a problem with rear brakes ( too hot ) at track or at high speed braking.

Also, I chek front calippers, they are good, and sliding just fine on carrier.

It few day I go to drift day, so I am a little bit worried for my rear brakes, I don't want to burn them.

Please help.

[Ivan141]

Are you sure you got all the air out, and that your master cilinder is working properly? I had this problem as well a short while ago.
I replaced my master cilinder and did some serious brake bleeding and the problem has gotten less bad, I intend to fit new discs and put cheap brake pads in the rear, and sports brakepads in front. That should help to move the brake bias more to the front.

[jamiemirror]

Use brake bias valve from GTS.
Or (better option) buy adjustable one from Willwood.

[Kas]

jamiemirror Wrote:Use brake bias valve from GTS.
Or (better option) buy adjustable one from Willwood.

I change bias valve from GTS.

I will try with steel brake pipes and maybe racing brake oil.

Do I need / must use DOT aproved brake?

Wich brake oil do YOU use?

[jamiemirror]

Kas Wrote:

jamiemirror Wrote:Use brake bias valve from GTS.
Or (better option) buy adjustable one from Willwood.

I change bias valve from GTS.

I will try with steel brake pipes and maybe racing brake oil.

Do I need / must use DOT aproved brake?

Wich brake oil do YOU use?

Kas, your problem is bias related - I think ? Check condition of you calipers - if they are OK - work to change bias. SS lines and racing brake fluid cannot cure the wrong bias.
PS: I use Motul DOT4 fluid.

[Kas]

jamiemirror Wrote:

Kas Wrote:

jamiemirror Wrote:Use brake bias valve from GTS.
Or (better option) buy adjustable one from Willwood.

I change bias valve from GTS.

I will try with steel brake pipes and maybe racing brake oil.

Do I need / must use DOT aproved brake?

Wich brake oil do YOU use?

Kas, your problem is bias related - I think ? Check condition of you calipers - if they are OK - work to change bias. SS lines and racing brake fluid cannot cure the wrong bias.
PS: I use Motul DOT4 fluid.

How can I change bias?

My brake calippers are OK, pistons are sliding ok when I release brake, the car is sliding. No leaking or somethig similar.

[jamiemirror]

Kas, as last possible solution - buy Willwood adjustable bias valve (~45USD).
Are front pads quality enough? I don't know why your fronts are too weak... (as you described this problem)

[Kas]

Update:
on track I haven't got problems with brakes. Becouse I use old discs on front, and they are so so, it was need some times to "adjust" pads to the discs, and it seems to be good for now.

Thanks to all.