Brakes locking up -98 Discovery 1 - Help!

terryjm1

Well-known member
Jan 23, 2011
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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
110
3
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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terryjm1

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Jan 23, 2011
110
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In threads I could find addressing this issue, no one posted back conclusively what resolved the problem. So, I am not going to be “that guy.” installed another master cylinder sold by Britpart (from Land Rover Direct) to replace the one I picked up on Rockauto. The problems completely went away after I installed the Britpart master cylinder. And, the abs light that had been on since I bought the truck went out. I have since driven it 120 trouble free miles and the brakes work better than ever. Lesson learned, don’t buy an off brand master cylinder. Thanks to those that suggested this was the issue.
 

jymmiejamz

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I don't think I would feel safe driving a vehicle with a Britpart master cylinder. That is a scary item to have fail in any way.
 

Tugela

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May 21, 2007
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I don't think I would feel safe driving a vehicle with a Britpart master cylinder. That is a scary item to have fail in any way.
What would you suggest as a preferable alternative? I'm anticipating needing to replace this part eventually so would like to know for future reference.
 

jymmiejamz

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What would you suggest as a preferable alternative? I'm anticipating needing to replace this part eventually so would like to know for future reference.
I don't know what the options are, to be honest. I'd be inclined to rebuild an original one before using a Britpart one.
 

ezzzzzzz

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Apr 22, 2010
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I hear complaints about britpart but have never had a failure in over 25 years and dozens of trucks. Maybe I just got lucky. Try unplugging the abs module and see if the problem persist. Ignore the dash lights while doing this. The only recourse is to follow logical troubleshooting. By the way, could it be the parking brake or do the calipers reek of burnt pads after that short run?
 

terryjm1

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Jan 23, 2011
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Reread my solution reply. The Britpart mc solved the problem. On the question of Britpart quality, I have found at least on some parts, they are simply reboxed oem parts.
 

WaltNYC

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Mar 3, 2010
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NYC
Britpart is really 'uneven' in quality. Buyer beware indeed.

For example I bought a hood release cable which failed on the very first pull (wire not crimped well enough into the end piece).

 

terryjm1

Well-known member
Jan 23, 2011
110
3
Lol, great post. The problem mc was another brand and I bought it so long ago from Rockauto I can’t remember what, probably raybestos or another common supplier. However, it was not Britpart. I can agree Britpart likely puts out some junk, like your hood release cable. The mc I received so far fits and works perfectly.

Another Britpart item I purchased was an AC compressor. It was literally identical to the LR part, same oem supplier, but over $500 less.
 
Regarding Britpart, it must be taken into account that this provider offers for almost all items (or part no's), the 2 alternatives: Genuine (suffix "G") or OEM / alternative (without suffix).
In the latter case, depending on the occasion, spare part can be OEM and its quality similar to genuine one, or an alternative that is not usually of good quality. It may be convenient or logical to use it for its low price, although in most cases it is not directly recommended. In my experience and my mates do not agree for example rubber parts (bushes, hoses) and worst of all: syncros for R380 box:eek:.

"G" suffix are ok, but BP sales agents try to prioritize the others because they give more profit;).

Regards
 
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jymmiejamz

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I hear complaints about britpart but have never had a failure in over 25 years and dozens of trucks.
Here is a great example of a Britpart failure. My coworker decided to replace his original rotoflex with one from Amazon. The one he got was Britpart. It lasted about 22 hours.



The same coworker bought a Britpart idler pulley (purchased at the same time as the rotoflex). It lasted about 500 miles. He had to be towed to the shop as it was a catastrophic failure on the highway. The bearing totally fell apart.
 

terryjm1

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Jan 23, 2011
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Just as an FYI, Land Rover Direct offers several brands if you loooking for a replacement. If I were to do it again, I’d go with TRW. Using their catalog isn’t the best. I usually find the part number I need from another source and then go to he their website and search using the part number. If they had a better online catalog system, I’m sure they would sell a lot more.


For now, I’m hopeful my Britpart is a repackaged OEM part. Visually it looks like a quality item, fits perfectly, and bled quickly. If I have a problem with it, I will update the post or start a new one. Maybe I will start a new one titled: Post your Britpart experiences! I was unaware of the huge question marks on Britpart as a relatively inexperienced Land Rover owner. As such, I have several Britpart items on my ride. (So far my hood release cable is aok).
 

p m

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Missed the thread.

Long time ago, I had a British Ford Transit van that's been in a head-on collision. After the van was repaired, the brakes tended to lock up after several applications; the pressure has been building in the system and not releasing. For a couple of weeks I honed up my skills in driving without using brakes, then gave up and started looking for a cause.
Apparently, the diaphragm of the brake booster had shifted a couple of c.h., which was enough for the piston in the master cylinder not to clear the pressure release ports. Made a 3mm spacer out of aluminum sheet, the problem went away.
I suspect there was nothing particularly wrong with the MC you took off, and the problem could have been resolved with a similar spacer. It's a hack solution, but not a dangerous one.
 

ezzzzzzz

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Apr 22, 2010
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Here is a great example of a Britpart failure. My coworker decided to replace his original rotoflex with one from Amazon. The one he got was Britpart. It lasted about 22 hours.



The same coworker bought a Britpart idler pulley (purchased at the same time as the rotoflex). It lasted about 500 miles. He had to be towed to the shop as it was a catastrophic failure on the highway. The bearing totally fell apart.
I don't discount that people have problems with Britparts. I'm simply stating that I haven't experienced these problems. That said, I do try to avoid the LR parts and their high prices. I try to find a good deal without buying junk. Compromise where I can and spendy where I have to.
 
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