jcb brakes

mark white · Post by **mark white** » Fri Jun 12, 2009 10:02 am

I am doing the brakes on my 1977 jcb 3c II. Not sure if it based on a Nuffield or Leyland skid unit? What is most likely?
It has the 4cyl engine with the simms injector pump and mechanical governor. I need to scrape off layers of yellow paint to get to the engine number.

The brakes are very similar to the Super Major. Dry disc brakes.
I have started to strip them down, the linings need replacing and are bonded to the metal rotating disc. I have seen just the linings advertised, but it would be easier if a company did exchange friction discs, or I may have to send them off to be relined?

I can't fully strip one side as the linkage is partialy seized by the adjusting nut, the nut is off but I can't get the sleeve thing off the operating rod ( just in front of the dust rubber). I have left to soak and will have another go saturday.

I also need another Clutch pedal and probably brake pedal return springs.

Any help or suggestions welcome, sorry for the long post!

Post by **Brian** » Fri Jun 12, 2009 1:09 pm

Mark,

If it is 1977 it will be a Leyland. They have similar brakes to the Super Major but have different splined hubs so are not compatible.

I would rather use riveted discs than the stuck on type. I have had problems with them on my Nuffy when the discs have come unstuck off the hub. I have now got riveted ones and these are much better.

I got mine from M.Hipperson, Downham Market , he is on E-Bay and I can really recommend him. You will need to return the old discs.

mark white · Post by **mark white** » Fri Jun 12, 2009 1:48 pm

Hi Brian,

Thanks for the reply.

If they are bonded, I guess the rivet holes would be underneath, can't see at the moment.

I have bought things off of Malcom before and he is very very good I will give him a call.

When I eventually get to the rebuild, is it best to leave the actuators plates / balls and splines dry or apply a smear of copper grease?

Post by **Brian** » Fri Jun 12, 2009 6:31 pm

I am depating that myself! I cleaned mine up about a couple of months ago and applied a smear of MS3 grease to balls and splines. One brake works perfectly and the other grabs like mad so its back to the drawing board.

I have heard that you can get a dry graphite to apply but have not seen anything yet.

mark white · Post by **mark white** » Mon Jun 15, 2009 4:26 pm

If my JCB is based on a leyland skid unit what model is it likely to be based on

My tractors have only ever been Fordsons,or the others I have being grey, starting with a 'F' but I won't mention the name

I have now got the offside apart, the linings are riveted on that side

I also now have an oil seal to do as the seal is starting to leak. Quite ironic as the best brake was the one with the leaking seal

I have used a smear of copper grease on both super majors of mine in the past. Just applying a smear to splines and balls, It has stopped the brakes sticking on, which one of them has been prone to.

Post by **Brian** » Mon Jun 15, 2009 7:32 pm

Will try the Copperslip and see what happens.

Not sure which Leyland you have under there. Up to about 1969 it would have been the 4/65. Is it a three or four cylinder?

mark white · Post by **mark white** » Mon Jun 15, 2009 8:13 pm

It's the 4 cly non turbo, with a simms mechanical governor injector pump.
I have found the engine number, but need to scrape off layers of thick yellow paint first

dexta4 · Post by **dexta4** » Wed Jun 24, 2009 5:36 pm

prob be a leyland 384 they were a common skid unit ?

essex pete · Post by **essex pete** » Fri Jul 03, 2009 7:54 pm

It may be the 4.98 type engine with about 65-70 hp.
So would that have made it a 272??

mark white · Post by **mark white** » Sat Jul 04, 2009 10:55 am

I must scrape off the paint and find the engine number, but thanks for the suggestions.

Post by **Brian** » Sat Jul 04, 2009 3:25 pm

Mark,
Its right at the back on the right side looking from the seat, on a flat area machined onto the block. Unlike Fords, you have to get over the top to see it and the head tends to get in the way.