Braking news (photos)

[Skoti]

Hi,
can any one tell me how much radial play should be on a CB750 F1 front brake caliper holder (45115 392 003). I've just fitted a new holder and I still have a wee bit of radial play but maybe because it could be a repro part and not a genuine Honda part.

BTW I replaced the holder to reduce front brake judder.

please see photos:

https://photos.app.goo.gl/axeqMDTWX9aLG2D39 

[hairygit]

Up and down play should be negligible, did you replace the arm and the pin?

Sent from my X6pro using Tapatalk

[Skoti]

Yes I replaced the arm and pin, please see photos.

Up and down play is about 1.5mm, is this normal?

[hairygit]

I would not worry too much about 1.5mm at the furthest point from the pivot. Make sure you give the pin a good coating of thick grease, that will help stop it seizing and wearing too fast, and some people drill and tap the arm at the pivot and fit a grease nipple.

[Skoti]

Thanks for the reply,
Fitting a grease nipple to the holder seems a good idea.

The old holder and pin I replaced had a lot of play and a massive amount of front brake judder when braking lightly, the new holder has reduced that some what.

I was concerned that the new holder was a repro part and not up to Honda spec, but if a little play is normal then I have to live with a little brake judder.

Thanks again for your reply. 

[hairygit]

I used to place a small "O" ring above and below the arm, it helped keep the grease in and water out, and will also take up any slack/judder. There are people on here , I think Trigger does it, that can bush the old arm and ream it back to stock size, so don't dump the old one!

[Trigger]

Yep, don't bin your old ones girls and boys. I can refurbish them so that they work better than the original units 

Try slacking off all three bolts , then push the pin up and tighten that bolt, then push the top bracket down and tighten up the top two. This should squish the 0 rings a tad.

[Spitfire]

A bit late but I have just checked my F1 and 1 to 11/2 mm play is the same as mine.

Cheers

Dennis

[Skoti]

Thanks for the replies.

Hairy Git, I have the 'O' rings fitted in the holder and the pin greased.

Dennis, thanks for measuring yours and reporting back.

Trigger, I'm going to follow your advice and slacken the 3 bolts and maybe push the pin up using a small 'G' clamp on the pin and top bracket. Perhaps that's why the 2 top bracket fixing holes are slightly slotted.
I'll keep the old stuff and PM you if I want them refurbished.

All good advice and help, thanks to everyone.

[Skoti]

Update.

As Trigger suggested I slackened the 3 retaining bolts, then I decided to apply a 'G' clamp to the bottom of the pin and the top of the top bracket.

The top bracket pulled down a little and I notice the pin now stands proud through the top bracket whereas before it was more or less level with the top bracket.

This has taken away most of the play, I will road test the bike soon and report back regarding brake judder.

Thanks to all who commented.