Brake problems with rear disc brake conversion

[Mats Myrstad]

Hey

I have a a currie rear end with disc conversion kit on my 1980 Regal, do you have any idea of what master cylinder i need to use ?? seems like the balance between front and rear is shit...

thanks
Mats

 

[bishir]

Still running the stock proportioning valve? Most rear disc conversions call for some sort of modification to the block and/or adding a adjustable proportioning valve.

 

[nonosv6]

That's funny, I kinda forgot about that when installing my ls1 brakes... Drum brakes use a residual pressure valve combined in the proposioning valve , hence the name combo valve , it keeps residual pressure in the line to the wheel cylinders.. I would imagine that would cause alittle drag on the rears... Please correct me if I'm wrong here, can't remember if the g-bodies used this type of system or not. I'll have to look it up in my gm books when I get home.

 

[QUIP'6']

Hey

I have a a currie rear end with disc conversion kit on my 1980 Regal, do you have any idea of what master cylinder i need to use ?? seems like the balance between front and rear is shit...

thanks
Mats

Need a disc disc proportioning valve

 

[charlief1]

Discs usually have a 2 pound residual and drums have an 8 pound one.

 

[nonosv6]

So I was.kinda.right. LOL

 

[V6UnderPressure]

This should fix your problem:

http://www.summitracing.com/parts/rsd-pv72/overview/year/1987/make/oldsmobile/model/cutlass-supreme

 

[bishir]

This should fix your problem:

http://www.summitracing.com/parts/rsd-pv72/overview/year/1987/make/oldsmobile/model/cutlass-supreme

Do you know if that is a direct bolt in swap... It looks like it, but was wanting to ask anyway.

 

[V6UnderPressure]

Do you know if that is a direct bolt in swap... It looks like it, but was wanting to ask anyway.

It is supposed to be. I actually purchased two of them (one for my cutlass and one for my buick). I'm 99% sure they use the same proportioning valve. I'll probably be installing it within a week or two so I can let you know. It is a nice piece though. What I am hoping for is that I will not need an adjustable valve. I know most will come on here and say "you need one to dial it in" but if this will bias the brakes without hassle, this will be a great mod.

 

[bishir]

if this will bias the brakes without hassle, this will be a great mod.

Yes, that's what will be interesting to know.... or at least how close will it get...

 

[V6UnderPressure]

Yes, that's what will be interesting to know.... or at least how close will it get...

I probaby wont know for at least a month or two, since the car probably won't be on the road till then. I'll keep ya posted.