Brakes locking up -98 Discovery 1 - Help!

terryjm1

Well-known member
Jan 23, 2011
62
1
I have a 98 D1 that I converted to 300TDI with 5 speed. It has been a long term project that is now on the road after years of inactivity. After I first got it drivable I went on a short run including the interstate, about 10 miles. Unfortunately, the brakes heated up to the point they almost completely locked up. I let it sit in the driveway overnight and they had released. As the brakes were very old and were unused for years, I decided to replace almost everything.

Here is what is new:

All 4 calipers and pads, (front D90 vented)
Front discs
All brake hoses replaced with braided stainless steel
Brake master cylinder

The only part that had been replaced before that test drive when the first locking problem occurred was the master cylinder.

Well, I took it out for another test drive today, after replacing calipers, pads, and hoses. (I also installed 2” lift springs and shocks, not that it matters) This time I only made it a few miles and didn’t make it home. After it sits for a while it eases up and you can move it. However, I only made it about a 1/4 mile and they were locked up again. I am going to give it a few hours and go back to see if I can nurse it home. Also, the brake pedal is as hard as rock when it reaches this point.

The only old stuff left is the prop valve and ABS unit. Could they be causing pressure to be held in the lines? Maybe I got a bad new master cylinder?

Any idea what could be causing this?

Thanks in advance!

Terry
 
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terryjm1

Well-known member
Jan 23, 2011
62
1
It has been so long I will have to look at my receipts to find out the brand. However, I am thinking the MC is the problem. I’m going to crack open the line at the MC and see if it releases the pressure. Just have to wait for the wife to come home to take me back to where I had to leave it parked.
 
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