I've read all I can and if I've missed it I apologize for asking it again.

What is the exact prop valve for the 1LE front brakes with drum rears?

And if I understand correctly the Earl's brake line kits have all the front lines long enough to work with the 1LE's.

Earl's 28A180 for 84-92 f-bodys with front disc.

These two items and the bolts and I'll be ready.

Thanks for any replys

Darrell

 

The 1LE proportioning valve is only for the '89-'92 4wheel disc brakes. No application info for 1LE front and drum rear.

I have the "big" 12 1LE 4 wheel brake system on my car.

I really do wish I could help you out. Perhaps you colud install the 1LE front brake package, and road test it with your existing propotioning valve. You can always change it later. Just a suggestion. I wish I had road tested mine before I changed the proportioning valve.

Thanx,ANDYZ28

 

Thanks Andy

I'll do just as you say and see what it does. The prop valve determines the front to rear braking bias......correct?

And if it does why not install an adjustable prop valve if its not correct with the stock disc/drum valve?


Any info on the hoses? Or was I correct with the application there?

Thanks

Darrell

 

I believe the stock prop valve will work fine. GregWestphal ran 1LE fronts with stock rear drums. See link below
https://www.thirdgen.org/techbb2/sho...s+drums+worked

 

I would try to use your original proportioning valve first. The proportioning valves on our cars are actuall referred to as "The Combination valve" I am not going to go into it's functioning now. But to install an adjustable valve has caused many people problems. Some members have had this adjusable valve adjusted as far as it will go, and still experienced rear (disc) brake lockup. This is especially true in any panic stop situation. The GM combination valve tends to "buffer" brake bias pressure in these situations.

When I do the 4 wheel 1LE brake upgrade to my '86 IROCZ. I am not going to replace the factory J50 combination valve. Then I will road test the car and try to determine the effect this has on brake performance.

I believe it is 25A190

Thanx,ANDYZ28

 

As Justin mentioned, the 1LE front/ rear drum setup seems to work fine with the stock proportioning valve in Greg's car and that is what I am also going to try in mine.

I don't know if the '89 and up rear disks are easier to change pads on than the '88 and older, but those were a serious PITA and have swayed me to keeping the drum rear. They stop just as well as disks for short periods, they just retain alot more heat. Aluminum drums can help with that though.

-Matt

 

The newer discs ARE much easier to change pads on. Also, the earl's lines do fit the 1LE fronts just fine.

 

Thanks for all the replys guys.

I'll try the valve just the way it is and install for now one of the sets of alum rear drums that I have.

And thanks for the hose info. I found a set of Earl's here in the Atlanta area for $62. Eight bucks lower than Summit

Now to decide to get the Earls solo bleeders or not. Any recommendations on those?

Thanks again

Darrell