Is there a proportioning valve for the brakes? - Mustang Evolution

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Old 07-24-2010, 07:46 PM   #1
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Is there a proportioning valve for the brakes?

2 questions.

Is there a proportioning valve? My mustang seems to nose dive when I brake which tells me the front brake bias is heavy. I have just installed eibach prokit springs and sways and it didn't help much.

I have a 5 speed and I can power block it so easy I'm surprised, which also tells me there is a heavy front brake bias. My 350Z couldn't do that and it had 50 more horsepower.

#2 do I have to romove the master cylinder to bench bleed it or can I crack the bleeders on the master cylinder and bleed normally? There are 2 bleed screws on the master cylinder.

Thanks in advance
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Old 07-25-2010, 12:22 AM   #2
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Re: Is there a proportioning valve for the brakes?

350z had trac control didnt it?
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Old 07-25-2010, 06:32 AM   #3
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Re: Is there a proportioning valve for the brakes?

^ I could turn it off just like on my mustang. But the 350Z did have EBD electronic brake force distribution which varied the amount of brake bias between wheels.
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Old 07-25-2010, 11:01 AM   #4
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Re: Is there a proportioning valve for the brakes?

I am pretty sure that you aren't going to have that on your mustang
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Old 07-25-2010, 05:27 PM   #5
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Re: Is there a proportioning valve for the brakes?

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Originally Posted by 91sleeper View Post
I am pretty sure that you aren't going to have that on your mustang
I know I don't have EBD on the mustang. But is there a proportioning valve? Just curious why the mustang nose dives so bad and if I need to remove the master cylinder to bench bleed it or can I do it while keeping it on?
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Old 07-25-2010, 06:17 PM   #6
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Re: Is there a proportioning valve for the brakes?

Mustang naturally has strong front and weak rears.
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Old 07-25-2010, 06:39 PM   #7
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Re: Is there a proportioning valve for the brakes?

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Mustang naturally has strong front and weak rears.
Ok, so is there a way to adjust that?

I see a little gold block that the brake lines go into about 6 inches away from the master cylinder, is that the proportioning valve? And is it adjustable?
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Old 07-25-2010, 07:21 PM   #8
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Re: Is there a proportioning valve for the brakes?

Not adjustable to my knowledge.
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Old 07-26-2010, 08:49 PM   #9
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Re: Is there a proportioning valve for the brakes?

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Originally Posted by ajpturbo View Post
I know I don't have EBD on the mustang. But is there a proportioning valve? Just curious why the mustang nose dives so bad and if I need to remove the master cylinder to bench bleed it or can I do it while keeping it on?
no proportioning valve no you don't have to remove the MC to bleed it.
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Old 07-27-2010, 09:35 PM   #10
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Re: Is there a proportioning valve for the brakes?

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no proportioning valve no you don't have to remove the MC to bleed it.
Wow that's gay...the car dives so hard and I have new eibach springs.

Wonder what the little gold block is then below the master cylinder that the brake lines go into then?

I bled the master cylinder and to my surprise there was quite a bit of air in it but the brakes feel the same.
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Old 07-28-2010, 02:48 AM   #11
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Re: Is there a proportioning valve for the brakes?

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Wonder what the little gold block is then below the master cylinder that the brake lines go into then?
without seeing it I would guess part of the ABS.
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Old 07-28-2010, 08:51 PM   #12
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Re: Is there a proportioning valve for the brakes?

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without seeing it I would guess part of the ABS.
No electronics or wires go into it though. It's right against the driver side fender just below the master cylinder.
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Old 07-28-2010, 09:43 PM   #13
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Re: Is there a proportioning valve for the brakes?

yes the car has a porp. valve. it is in the location your talking about. it is pre set from the factory and is not adjustable.

the master can be bleed on the car, but you will need to bleed the entire system also.

the bias is heavy to the front because the car is very light in the rear. If you lessen the bias to the front the back brakes will lock in the rear causing the to slide.
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Old 07-28-2010, 10:05 PM   #14
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Re: Is there a proportioning valve for the brakes?

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yes the car has a porp. valve. it is in the location your talking about. it is pre set from the factory and is not adjustable.

the master can be bleed on the car, but you will need to bleed the entire system also.

the bias is heavy to the front because the car is very light in the rear. If you lessen the bias to the front the back brakes will lock in the rear causing the to slide.
So I've bled the MC. You're saying I need to bleed everything else again?

Just a small tweak would be good I think. I know you don't want it too strong rear.
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Old 07-28-2010, 10:24 PM   #15
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Re: Is there a proportioning valve for the brakes?

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yes the car has a porp. valve. it is in the location your talking about. it is pre set from the factory and is not adjustable.
a 99-04 mustang does not have a brake Proportioning Valve, maybe a 05+ does.
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