944 S L4-2479cc 2.5L DOHC (1987)
ATTENTION: This bulletin replaces Technical Bulletin Group 4, Number 8907, dated June 2, 1989.
The front and rear brake calipers of the 944 S2, 944 Turbo, and 928 S4 for Model 89 received modifications in the area of the pistons and dust seals
(now similar to the two piston calipers). Refer to the chart below for identification.
Replacement and repair procedures are different for each type of caliper and are detailed on the following pages.
Repair Instructions
Caliper Replacement
New type calipers can be fitted to earlier cars. After stocks of early version calipers are used up, only the new type calipers (with dust caps and modified
pistons) will be available. New version calipers (with dust caps) cannot be paired with early version calipers (with scraper rings). Measure the brake
piston diameters to be certain the correct calipers are installed during repairs. Failure to install brake calipers with the correct piston sizes side to side
will cause uneven braking. Use the following chart to determine piston diameter applications.
Caliper Repairs
Repair sets for early version and new type calipers are available. New type pistons and dust caps cannot be installed on early version calipers. When
rebuilding brake calipers, use only sliding lubricant P/N 000 043 117 00 on the pistons and sealing rings during assembly. Refer to Technical Bulletin
Group 4, Number 8901, dated April 2l, 1989 for further information.
