Technical Data

Designation

Remarks, dimensions up to end of 88

as of MY 89

Wear limit up to end of MY 88

as of MY 89

Operating brakes (foot brake)

Brake booster (light weight built) Boost coefficient

Brake master cylinder*** (aluminum design) 0 in mm

Brake power regulator in rear axle circuit switchover pressure/ reduction coefficient

Brake discs 0 front rear

Effective brake disc dia.

front rear

Hydraulic dual-circuit brake system with front/rear axle circuit division (black/white), brake booster, vented brake discs with fixed caliper on front and rear axle. The pushrod brake circuit is allocated to the front wheels. 4 pistons per each fixed caliper. ABS optional as of MY '87 (M593), as of MY '88 included in standard specification of some models.

0 9 inch

up to end of MY '86 23.81/19.05 MY '87/88 23.81/20.64

18 bar/046

299 mm

246 mm

23.81/20.64

18 bar/046

304 mm 299 mm

250,8 mm 246 mm

* 944 turbo special model "S" (M 758)

*** for vehicles with ABS (optional equipment as of MY '87 / standard as of MY '89) with two central valves

Designation

Remarks, dimensions up to end of MY 88

as of MY 89

Wear limit up to end of MY 88

as of MY 89

Piston dia. in brake caliper front, mm

2 x 36 + 2 x 38 MY 87/88 2 x 36 + 2 X 40 (2 x 36 + 2 x 44)*

2 x 36 + 2 X 44

rear, mm

2 x 28 + 2 x 30

2 x 28 + 2 x 30

Brake pad thickness front rear

13 mm 13 mm

13 mm 13 mm

2 mm 2 mm

2 mm 2 mm

Brake pad area (each front wheel

86 cm2 (126 cm2)*

126 cm2

Brake pad area (each rear wheel)

86 cm2

86 cm2

Total brake pad area

344 cm2 (424 cm2)*

424 cm2

Brake pad thickness, new front rear

28 mm (32 mm)* 24 mm

32 mm 24 mm

Min. brake disc thickness**

after refacing front rear

26.6 mm (30.6 mm)* 22.6 mm

30.6 mm 22.6 mm

26 mm (30 mm)* 22 mm

30 mm 22 mm

Tolerance of thickness of brake disc max.

0.02 mm

0.02 mm

Lateral runout of brake disc max.

0.05 mm

0,05 mm

Lateral runout of fitted brake disc max.

0.1 mm

0.1 mm

Lateral runout of wheel hub max.

0.05 mm

0.05 mm

Surface roughness of brake disc after machining max.

0.006 mm

0.006 mm

* 944 turbo special model "S" (M 758)

* 944 turbo special model "S" (M 758)

The brake disc may only be machined symmetrically, i.e. in a uniform manner on both sides

CHECKING THICKNESS OF BRAKE PADS Note

All brake pads on one axle must be replaced when the brake pad wear indicator lamp comes on, and no later than when remaining pad thickness is 2 mm. If brake pad wear is reported by the indicator lamp, the warning contact (sensor including wire and plug) must also be replaced. Warning contact replacement is not necessary if brake pads are replaced no later than with a thickness of 2.5 mm. Warning contacts whose electric lead core is ground (worn) must be replaced. Replacement is not necessary when only the plastic part of the warning contact is worn.

1. Remove wheels to check thickness of brake pads.

Wear limit is reached when pad has a remaining thickness of 2 mm.

2. Visually inspect brake pads for wear.

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