Service-InformationM otorcycle
Group: 34
BMW NA Brakes
Service Department
Disk Brake Squeal – All Models
March, 1988
34 01-5 88
(2266) For USA Only
In Service Information 34 010 86 (2220) we discussed the design and
philosphy of the BMWBr ake System.
Since writing that Service Information, we have investigated various
chemicals and anti-squeal components. Although many products reduce the
squeal significantly, none of them possess the qualities of safety and
durability required for approval.
We have evaluated a shim, used on BMWau tomobiles (part no. 32 21 1 116
006). If this part is installed in a caliper with new brake pads,
insufficient expansion clearaRce may exist. If the motorcycle brake is
applied aggressively or on a prolonged down-hill situation, expansion of
the brake components due to heat buildup could cause brake system overheating
and possible wheel lock-up.
USE OF THIS PARTC ANC OMPROMISTEH E SAFETYA NDP ERFORMANCE
OF THE BRAKINGS YSTEMA NDT HEREFORCE ANNOTB E APPROVED,
The positive qualities of our brake pad materials far outweigh the
negative effect of brake noise. We will, however, continue to research
ways to reduce annoying brake noise.
Very truly yours,
BMWO F NORTAHM ERICAIN, C.
&~~)
Frank Stevens Richard Dampf
National Service Manager National Technical Manager
RD:jel/139
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