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Old September 28th, 2014   #1
SodaMichael
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Default Rear Brake Disc gets Hot

I just changed tires on my ST (Metzler Z8) and noticed that my rear disc gets really hot after riding for 1 or 2 miles. Is this common? I never noticed this before because since the side bags were on and had no need to check it.
The disc cools down about five minutes after riding, but I'm concerned that something else might be wrong. I can put my hand on the front discs so they're not affected.
I've checked the caliper pistons and sanded the pads before re-instaling.
Any ideas?
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Old September 28th, 2014   #2
v4forever
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Default Re: Rear Brake Disc gets Hot

Did you clean your caliper pistons before you retracted them.
You may need to do a brake bleed.
Also, there is 2 slider pins on the rear caliper that needs brake grease. AKA silicon grease.

Last but not least, you may have the dreaded sticking secondary master cylinder piston.
That would call for a new SMC.
There are rebuild kits for them, but a new one is a bullet proof way to know you did it correctly.
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Old September 28th, 2014   #3
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Default Re: Rear Brake Disc gets Hot

Define hot?
The rear disc is surrounded by hot exhausts so will feel hotter than the front discs anyway.
Does the rear wheel spin easily on the main stand?
There's loads of info here regarding the secondary master cylinder, SMC, a search will tell you what you need to know, perhaps someone with a better memory than me could post a couple of links.
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Old September 29th, 2014   #4
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Default Re: Rear Brake Disc gets Hot

Do some research on the SMC thats seconday master cylinder, located on the left front caliper. When you use the front handbrake it activetes the SMC which applies the rear brake also. If the workings of the SMC get sticky it can constantly apply the rear brake. This can cause your problem. So can the other things mentioned.

Good luck and tell us what happens!
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Old September 29th, 2014   #5
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Default Re: Rear Brake Disc gets Hot

Quote:
Originally Posted by v4forever View Post
Last but not least, you may have the dreaded sticking secondary master cylinder piston.
That would call for a new SMC.
There are rebuild kits for them, but a new one is a bullet proof way to know you did it correctly.

This looks to be one of those statements that justifies a very simple WTF.

When did a sticking SMC call for a rebuild?
A total replacement?

The vast majority of sticky SMC's can be traced back to road grime on the pistons not allowing them to fully retract, a maintenance issue.
Corrosion would rank about number two, once again ever do simple maintenance? it does wonders when it comes to finding things before they become a issue .
Either way a full rebuild or replacement does not render the SMC bullet proof by any means, there is still the standard continuing maintenance to recon with.

If you are going to use recall as your maintenance schedule plan of having major expenses to a bike that delivers dependable service with minimal care. Care being the key to dependability.


Paul
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Old September 29th, 2014   #6
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Default Re: Rear Brake Disc gets Hot

I'd agree with Paul above.


Quote:
Originally Posted by v4forever View Post
You may need to do a brake bleed.
Also curious to know why you would think bleeding the brakes would improve them from binding?
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