R90/6 Brake job

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redavide
Posts: 103
Joined: Tue Dec 04, 2007 12:33 pm

R90/6 Brake job

Post by redavide »

Under what conditions should a brake disc be replaced (R90/6)? They're kind of pricey (dual discs on my r90/6) -- about $300/each and I don't want to buy new ones if it's not necessary.

Also, after removing the calipers the rubber seals obviously need to be replaced. The replacement kits I found include a new piston, but my pistons look fine. Anyone know where to buy just the rubber seals??

Thanks!

Heizer
Posts: 2
Joined: Thu Jun 10, 2021 8:14 pm

Re: R90/6 Brake job

Post by Heizer »

I got mine from boxer2valve.com but other companies sell them as well. They may not show on their websites.

redavide
Posts: 103
Joined: Tue Dec 04, 2007 12:33 pm

Re: R90/6 Brake job

Post by redavide »

Found rubber seals on boxer2valve.com

Thanks.

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schrader7032
Posts: 7687
Joined: Fri Oct 27, 2006 3:00 am
Location: San Antonio, TX

Re: R90/6 Brake job

Post by schrader7032 »

I think I found individual caliper parts for my /7 from Ted Porter in California.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

redavide
Posts: 103
Joined: Tue Dec 04, 2007 12:33 pm

Re: R90/6 Brake job

Post by redavide »

Any opinions on when replacing brake discs is necessary?

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schrader7032
Posts: 7687
Joined: Fri Oct 27, 2006 3:00 am
Location: San Antonio, TX

Re: R90/6 Brake job

Post by schrader7032 »

I believe the disks have a minimum thickness stamped into the inner edge somewhere. Also, if the disk is grooved where the pad has been running in it, that would indicate uneven or bad wear.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

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srankin
Posts: 271
Joined: Fri Jul 14, 2017 8:45 pm
Location: Spencerport, NY USA

Re: R90/6 Brake job

Post by srankin »

LOL, remember to measure the disc thickness in one of the groves if any. Also look for any cracks around the mounting bolts. St.
Owner of a 84, R80RT and 78, R100RS

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