disk wear?

[Jean Lachaud]

Hi Bill:

New discs are 5mm thick.  3.7mm does sound quite low for 37k miles (are you sure of the mileage?), but that is not a rule cast in concrete.

The wear limit is indeed 4 mm (Clymer is right, that is a rarity, you're in luck).

You need to replace your discs SOON. The thickness limit is intended to protect the discs from warping, cracking and or breaking under thermal stress, in particular. 

Don't forget that brakes are a safety item. In the aviation world, your aircraft would be grounded.


-- 
Jean Lachaud 
1994 R1100RS - 1977 R100/7 
ABC #8889, MOA #56663




> -----Original Message-----
> From: Bill <bachman.bill at gmail.com>
> Sent: Saturday, 10 July, 2021 15:49
> To: mdairheads at casano.com
> Subject: disk wear?
> 
> Hi All,
> 
> I have an `88 R100 with dual front disks and gave the brakes a safety check
> today.
> 
> Pads were fine but the disks were under spec, 3.7mm.  Clymer says they
> should not be less than 4mm.
> 
> My questions are:
> 
> 1. Does that sound like normal wear for 43k miles?  (I know "depends", but
> generally?)
> 
> 2. What is the thickness of a new replacement disk?  (just curious, outer edge
> of old disk reads 4.2mm)
> 
> 3.  How soon should I plan on replacing the disks?  (and I assume new pads at
> same time.)
> 
> thanks,
> 
> Bill Bachman


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