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Home >> Porsche >> 2019 >> 718 Boxster Base, Automatic DCT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (46 Brakes - Brake Mechanism 2.5L -- 982 - BOXSTER/CAYMAN) >> WM, 4600TW Technical Data/Brake Wear Limit >> Technical Values

Technical Values

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Location Description Type Basic value Tolerance 1 Tolerance 2
Brake booster gear ratio (i)   Factor 5.5    
Brake disc diameter, front   Diameter 330 mm    
Brake disc diameter, rear   Diameter 299 mm    
Effective brake disc diameter, front   Diameter 266, 6 mm    
Effective brake disc diameter, rear   Diameter 247.6 mm    
Piston diameter in front brake calliper   Diameter 38/38 mm    
Piston diameter in rear brake calliper   Diameter 28/30 mm    
Effective brake pad area per wheel, front   Area 167 cm2    
Effective brake pad area per wheel, rear   Area 96 cm2    
Pad thickness, front   Measured value 12 mm    
Pad thickness, front (wear limit)   Measured value 2 mm    
Pad thickness, rear   Measured value 10.3 mm    
Pad thickness, rear (wear limit)   Measured value 2 mm    
Brake disc thickness, new (front)   Measured value 34 mm    
Brake disc thickness, new (rear)   Measured value 30 mm    
Brake disc wear limit, front   Measured value 32.0 mm    
Brake disc wear limit, rear   Measured value 28.0 mm    
Maximum surface roughness of brake disc after machining   Measured value 0.006 mm    
Maximum thickness tolerance of brake discs   Measured value 0.02 mm    
Maximum lateral runout of brake disc   Measured value 0.03 mm    
Maximum lateral runout of wheel hub   Measured value 0.03 mm    
Maximal lateral runout of brake disc when installed   Measured value 0.06 mm    
Push-rod play Measured at brake pedal plate Measured value approx. 1 mm    
Diameter of parking-brake drum Parking brake (electrically actuated, drum brake acting on the rear axle) Diameter 180 mm    
Diameter of parking-brake drum, wear limit   Diameter 181 mm    
Width of parking-brake shoe   Measured value 24 mm