Very odd new Caliper replacement problem!!!

[DMT]

I have been replacing the brakes the past few days.

Started the front rebuild today. Replaced hose, disc, dust shield and caliper. When I fitted the new caliper the bottom of the caliper hit the disc, the top was fine.

The complete set was bought from Rimmer so I assumed they were OK. After exhaustive checks all the new parts were exactly the same size as the original ones.

I refitted the old parts and found I had the the same problem, so I assume I have mucked up somewhere.

I loosened all the bolts on the Stub shaft assy as previous topics have mentioned and when retightening the problem was a bit better.

I found that if I put a straight edge on the top caliper bracket it showed the bottom bracket to be parallel but has an offset of about 2mm. These brackets are on the same stub axle casting so I assume there is no adjustment.

I did not find any shim when removing the original parts.

The dust shield acts as a spacer to both brackets so I added an old dust shield lug as a shim to the lower bracket and the disk now seems to be running true, almost in the centre of the calliper.

Surely adding this is shim wrong, Have I missed something.

Any help much appreciated.

I will be looking at the other caliper tomorrow to see if it is the same.


Dave

[sujitroy]

Has the vertical link got bent in any way or the shaft where the caliper sits on got bent?
Sujit

[DMT]

I could not see anything that looked wrong. I will compare to the other side tomorrow,
Dave

[flying farmer]

If it was the same on the old caliper then it has likely been a problem since the car was new.
I have regularly found this on various triumphs and check the centralisation of the disc whenever i fit a caliper as I have had to shim loads of them in the past
Neil

[DMT]

Thanks Neil

Should the disc be in the centre of the caliper or does it just need to be parallel?
Regards
Dave

[Lingen]

Dave.
I think it should be both.
Mike.

[Lingen]

P.S.
Or the pads won't fit!
Mike.

[DMT]

Not a good day today. Started on the other side, all started well, it looked like the new caliper would fit correctly, BUT the steering tie rod lever bolts were seized, big time. I managed to turn the bolt a bit with a 900mm breaker bar but eventually rounded off the bolt. Had to cut the lever off,

Have now ordered new levers and Vertical links both sides, and as one of the struts looked dodgy two of them too,

Will need to find the grandson's piggy bank.

Dave

[gbb483]

I started to fit my new callipers today, assuming I had all I needed. After degreasing and wire brushing the mounting lugs on the hub I found 3 rotten shims on the floor one side and 2 on the other (about the right size for a 7/16 bolt). Initially I assumed these fitted between the lugs for the top long bolt to take out slack.

However, having found this thread I now assume they were from the bottom short bolt and are needed to square up the calliper with the disk. What is the net wisdom on these? Any ideas on what size are needed? The only one I've found from the suppliers that looks remotely suitable is 145275 which is for the left hand timing gear, but other than stating 0.004 it doesn't give a size.

[gbb483]

P.S. as the short bolt also has the back plate wedged behind it, a few 0.004 shims are insignificant.

[DJT]

Look here for the shims: https://rimmerbros.com/Item--i-GRID005271

There should not be any shims for the calliper mounts. The ROM is wrong in that the shims won't fit the larger front upper bolts, only the smaller diameter lower bolts.

IMG_0573.jpg

[gbb483]

The only bolts I have touched are the two calliper mounting bolts. I've just done a dry fit and am pretty sure the shims came from in-between the top two lugs where the long bolt goes. It might have been a mod by a PO, and I can't see them doing any harm.

[flying farmer]

Might have been the same problem as the original post, previous owners have had to shim the caliper to make it fit

[gbb483]

In the process of fitting my replacement callipers I checked the ROM for the torque settings. It says (scanned pdf version) on page 06-3 Front suspension : Calliper to vertical link : 7/16 UNF : 50 to 65. The paper version is similar except it only states 65. My problem? The bolts are 5/8 UNF. Can anyone enlighten me?

[gbb483]

OK - The answer is that the bolts are defined by the diameter of the shank (7/16), whilst the socket required is defined by the width across the flats of the head (5/8) - I think.