Rear Brake Nonsense With The Bonneville

Sun was out and due to meet up with friends at their house around 20 miles away - "are you taking the bike" she says (the answer is obvious) "I'll come with you" she says. This would be the first time since last September - the bike has been fine and I was out on it twice on Thursday.

Less than a mile form our destination and at around 35 mph, the bike suddenly feels as if you've shifted up from 2nd gear to 5th by mistake and runs like an absolute pig. I shift down to 3rd and then 2nd but it still runs badly but by and then we're at the turn anyway so come off the main road and prepare to stop but it suddenly picks up OK so we go on another 300 yards to the house.

Get off the bike and the rear brakes are smokin' big time - the disc is actually blue. Leave it all to cool down and then take a look. On the centre stand and I can barely turn the rear wheel by hand and the brake pedal is almost solid when you try and push down on it. I manage to get one pad retaining pin out with my limited tool kit but the other one rounds off!

Thankfully borrow a socket set and a set of hex keys and have the caliper off. The pistons are seized solid and nothing is moving so not much else I can do. Unbolted the banjo nut and no fluid comes out. Get a jar and pump the pedal and eventually with a "gush" all the fluid comes out and the pedal is free. Rode home with caliper in the rucksack and the hose cable tied up to the frame.

Looks like I could need a new disc, will need to drill one pin out of the caliper and then if it's salvageable a seal kit and new pistons probably. Going to look at it properly this morning. May now consider the Motone caliper relocation bracket as well!

By the way - World of Triumph want £405.00 for a new caliper and £143.00 for a new disc, plus £64.21 for new pistons and £24.22 for the seals! (plus postage of course).


Doesn't really look blue here (but it is)

How to get home!

 

Caliper is OK - cleaned up well and old retaining pin is now drilled out! Pistons pushed back in by hand so they probably aren't seized - suspect the brake hose!
Ordered new one and new pins and will check the disc to see if it isn't warped.

 

It's much cleaner than it looks and covered in WD40 chain wax. Unfortunately after a couple of days it makes the chain look rusty!

 

No not that long ago - same day I met you and crispey at Loomies

 

More investigation needed I think. Haven't had the hose off yet but will look at that tomorrow!

 

That was my thought as it seemed as if the brake were locked on and as I now know the piston move freely.

 

Slightly glazed pads and remains of the retaining pin.