Rear Brake Bleeding

[93mtxSHOw]

Hi Everyone, I am new to this forum. I just bought a 93 MTX and the rear calipers pistons were frozen, so I replaced them and I am trying to bleed the brakes now, but there is no fluid going to the calipers. Does anyone have any opinion on this? I'm new to the SHO, so any help would be appreciated.
THANKS!

Adam

 

[Rockledge]

Collapsed brake hoses, possibly.

 

[Minnesho]

Collapsed brake hoses, possibly.

i second the notion. it happened to mine, after it sat for only 2 months. and it happened to both sides at the same time. disconnect the rubber line from the line end, not the caliper and and see if fluid comes out of the hard line. if it does, its the hoses for sure.

 

[Xs SHO 1]

Bleeding the rear brakes requires the rear tires to be on a flat surface or leveled surface. The proportioning valve prevents fluid flow when the rear wheels are elevated....

 

[93mtxSHOw]

I will try to elevate the car on a more level surface and see what happens and let you guys know. Thank you.

 

[masho95]

Bleeding the rear brakes requires the rear tires to be on a flat surface or leveled surface. The proportioning valve prevents fluid flow when the rear wheels are elevated....

You can bleed the rear brakes with the tires in the air. The proportioning valve only restricts fluid flow depeneding on the suspension compression, it doesn't CUT OFF all flow.
You have collapsed rubber hoses, or a restriction somewhere else.

I'd put money on the hoses. BOTH my rear collapsed and the rear brakes were frozen. EVERYTHING was replaced... got to start all new :

 

[93mtxSHOw]

So you suggest that I replace just the rubber hose from the hard line to the calipers first?

Thanks

 

[projectSHO89]

So you suggest that I replace just the rubber hose from the hard line to the calipers first?

Thanks

I suggest you make certain the left rear wheel's suspension is NOT free-hanging. That side must be properly compressed (normal ride height) otherwise the proportioning valve will keep fluid from flowing to the caliper. You cannot bleed the rear brakes if the proportioning valve is closed

If you want to test the rubber hoses, just remove them and see if air will blow though them. I wouldn't buy any parts until you have done both things.

Steve

 

[masho95]

I suggest you make certain the left rear wheel's suspension is NOT free-hanging. That side must be properly compressed (normal ride height) otherwise the proportioning valve will keep fluid from flowing to the caliper.

So what you are saying is that when I bled my rear brakes with BOTH rear tires in the air my proportioning valve must have been open. So it's not functioning properly? And I should fix it?

 

[Minnesho]

my brakes bled fine with the car in the air and both tires hanging too ... in my case the hoses were collapsed. and you coulndt even tell by looking at them. i'll bet money yours are too.

 

[etc1006]

What I did was had the rear on jackstands and used a jack to lift the left rear knuckle til you just notice it lifting the car. Then you know the weight is "simulated". Then goto the union where the rubber hoses meet the metal in the fenderwell. Break those threaded connections. You'll probably have to spray w/ PB Blaster or the like. I had to actually use a small pair of vise grips to get a good enough bite on the flare nut to break it free. Then try to bleed the brakes. If you got fluid at the metal lines then your rubber ones are shot inside. If you want to take the rubber ones off and try to flush them with brake cleaner to see if they're free. If so, get new washers and put them back on. IIRC my right rear IIRC was bad when I did this. HTH!

 

[93mtxSHOw]

What about the ABS system? Would I have to use a special tool on the master cylinder to bleed the brakes because of the ABS? Otherwise I tried to get the hoses off from the hard brake line to the rubber one and it wasn't coming off, it was way too rusted and the bracket was going to break off if I tried any harder. I will try harder if its not the ABS system. OH, and there are 2 different nuts holding the hard line to the rubber...do I have to hold one tight with pliers and turn the other?
Thanks a lot guys for all the responses!

 

[etc1006]

You shouldn't need the ABS bleeder. I even had a couple of hard lines blow and still didn't need it... You're gonna have to try a bit harder on the union at the rubber/metal. Use another pair of vise grips or the like on the bracket. I had to do this on the one on mine.