Rear disc running very hot

sharpo · 21-May-2005, 15:27

I have noticed the rear disc is very hot even if I stay off the rear brake, what can cause this on the 916.
I've bled it and the pistons don't appear to be sticking but they are bone dry, would a little copper grease help em retract or what.

Thanks for your reply you font of all knowledge.

Chaz · 21-May-2005, 15:45

I had that hapen to me I found that although I wasn't using the rear brake I was resting my foot on it put a bit more free play in it, worked for me.

Chass

rockhopper · 21-May-2005, 19:54

Dont put copper grease on the pistons, you need special brake grease.

sharpo · 22-May-2005, 10:22

chass i'll give it a go

rockhopper how "special"

rockhopper · 22-May-2005, 15:10

erm, something in a tin labled "brake grease"!! Its got to be safe on the rubber seals. Copper grease contains tiny bits of copper so you shouldnt use it on moving parts as it'll wear them away!

sharpo · 22-May-2005, 21:13

I'll be buggered "brake grease" why dint I think o that.

If it's that red stuff we've got it at work, but i'll buy me own of course

Go Galfer · 29-May-2005, 18:38

Couple of thoughts would be that the resevoir is over filled or possibly that you need to rebuild the calipers and master cylinder.

sharpo · 29-May-2005, 22:01

I'm gonna strip it down and clean everything, I've been told they don't sell the seals though ?

A new caliper is only £60 right ?

Fordie · 30-May-2005, 20:15

£69.72 including the VAT from On Yer Bike . Remember the heat from the Exhaust does get the master cylinder reasonable hot and if the fluid resovior is to full stops any expansion. Also, the adjusting rod that fits into the rubber grommet on the master cylinder it should be able to be withdrawn enough to allow the fluid to return back through the seal plunger. I had too replace 2 calipers within a month because of this . So dont try to have to little rear brake travuss on the foot lever. There do not sell parts only for Brembo brakes . 4D

[Edited on 30-5-2005 by Fordie]

Webcore · 31-May-2005, 12:51

Happened to me - the rear master cylinder was knackered - the pedal wasn't returning properly - ended up costing me a disc, caliper and master cylinder. New seals/master cylinder should cure it.

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21-May-2005, 15:45	#2
Chaz Registered Forum User Ducati Corse Bikes: 916 Strada Posts: 3,844 Join Date: Jul 2003 Location: At some track or another:) Mood: www.od2racing.co.uk I had that hapen to me I found that although I wasn't using the rear brake I was resting my foot on it put a bit more free play in it, worked for me. Chass Reply

21-May-2005, 19:54	#3
rockhopper Registered Forum User Ducati Corse Posts: 3,367 Join Date: Jul 2001 Location: Pinxton Dont put copper grease on the pistons, you need special brake grease. Reply

22-May-2005, 10:22	#4
sharpo Registered Forum User Mille Posts: 192 Join Date: Feb 2005 Location: East Yorkshire Mood: Big bill-money well spent chass i'll give it a go rockhopper how "special" Reply

22-May-2005, 15:10	#5
rockhopper Registered Forum User Ducati Corse Posts: 3,367 Join Date: Jul 2001 Location: Pinxton erm, something in a tin labled "brake grease"!! Its got to be safe on the rubber seals. Copper grease contains tiny bits of copper so you shouldnt use it on moving parts as it'll wear them away! Reply

22-May-2005, 21:13	#6
sharpo Registered Forum User Mille Posts: 192 Join Date: Feb 2005 Location: East Yorkshire Mood: Big bill-money well spent I'll be buggered "brake grease" why dint I think o that. If it's that red stuff we've got it at work, but i'll buy me own of course Reply

29-May-2005, 18:38	#7
Go Galfer Registered Forum User Posts: 11 Join Date: Apr 2005 Location: Los Angeles, CA Couple of thoughts would be that the resevoir is over filled or possibly that you need to rebuild the calipers and master cylinder. Reply

29-May-2005, 22:01	#8
sharpo Registered Forum User Mille Posts: 192 Join Date: Feb 2005 Location: East Yorkshire Mood: Big bill-money well spent I'm gonna strip it down and clean everything, I've been told they don't sell the seals though ? A new caliper is only £60 right ? Reply

31-May-2005, 12:51	#10
Webcore Registered Forum User Mille Posts: 150 Join Date: Nov 2004 Location: London Happened to me - the rear master cylinder was knackered - the pedal wasn't returning properly - ended up costing me a disc, caliper and master cylinder. New seals/master cylinder should cure it. Reply