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Home >> Porsche >> 2012 >> Cayenne S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 48 (46 - Brakes - Brake Mechanism (4.8L Turbo) -- 92A - Cayenne (92A)) >> WM, 4650TW Technical Data/Brake Wear Limits >> Technical Values >> Overview

Technical Values: Overview

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Location Des... Type Basic val... Toleranc... Toleranc...
Service brake (footbrake) with grey cast iron brake discs (standard brake) with PSM (Porsche Stability Management) as standard Hydraulic dual-circuit brake system with brake-circuit division per axle. Vacuum brake booster, internally ventilated brake discs with six-piston aluminium monobloc fixed-calliper brake on front axle and four-piston aluminium monobloc fixed-calliper brake on rear axle.        
PSM Porsche Stability Management (PSM) as standard with the functions Antilock Brake System (ABS), Anti-Slip Regulation (ASR), Engine Drag Torque Control (EDTC), Automatic Brake Differentia l (ABD), brake force boosting, brake system pre-filling.        
Tandem brake booster Ø (vacuum)     9/10 Zoll    
Boost ratio     8    
Brake master cylinder Ø     28.57 mm    
Brake-circuit division     24/12 mm    
Brake disc Ø, front     390 mm    
Brake disc Ø, rear     358 mm    
Brake disc thickness, front     38 mm    
Brake disc thickness, rear     28 mm    
Thickness tolerance of brake disc, max.     0.01 mm    
Effective brake disc Ø, front     323.4 mm    
Effective brake disc Ø, rear     302.2 mm    
Piston Ø in front brake calliper 6 x 36 mm        
Piston Ø in rear brake calliper 4 x 32 mm        
Brake pad area, front     480 cm2    
Brake pad area, rear     200 cm2    
Total brake pad area     680 cm2    
Service brake (footbrake) with PCCB brake discs with PSM (Porsche Stability Management) as standard Hydraulic dual-circuit brake system with brake-circuit division per axle. Vacuum brake booster, internally ventilated brake discs with six-piston aluminium monobloc fixed-calliper brake on front axle and four-piston aluminium monobloc fixed-calliper brake on rear axle. The brake callipers are painted yellow for visual differentiation.        
PSM Porsche Stability Management (PSM) as standard with the functions Antilock Brake System (ABS), Anti-Slip Regulation (ASR), Engine Drag Torque Control (EDTC), Automatic Brake Differentia l (ABD), brake force boosting, brake system pre-filling.        
Tandem brake booster Ø (vacuum)     9/10 Zoll    
Boost ratio     8    
Brake master cylinder Ø     28.57 mm    
Brake-circuit division     24/12 mm    
Brake disc Ø, front     420 mm    
Brake disc Ø, rear     370 mm    
Brake disc thickness, front     40 mm    
Brake disc thickness, rear     30 mm    
Thickness tolerance of brake disc, max.     0.01 mm    
Effective brake disc Ø, front     351.8 mm    
Effective brake disc Ø, rear     314 mm    
Piston Ø in front brake calliper 6 x 36 mm        
Piston Ø in rear brake calliper 4 x 32 mm        
Brake pad area, front     480 cm2    
Brake pad area, rear     216 cm2    
Total brake pad area     696 cm2    
Pad thickness, front Wear limit 2 mm   approx. 9.7 mm    
Pad thickness, rear Wear limit 2 mm   approx. 8.8 mm    
Brake disc thickness, front New   38 mm    
Brake disc thickness, rear New   28 mm    
Brake disc wear dimension, front     36 mm    
Brake disc wear dimension, rear     26 mm    
Lateral runout of brake disc, maximum     0.03 mm    
Lateral runout of wheel hub, maximum     0.02 mm    
Lateral runout of brake disc when installed, maximum     0.06 mm    
Pushrod play Not adjustable        
Parking brake (foot-operated parking brake) Drum brake acting mechanically on both rear wheels        
Parking-brake drum Ø Wear limit 211 mm   210 mm    
Brake shoe width     30 mm    
Brake pad thickness Wear limit 1 mm   3 mm    
Pad thickness, front Wear limit 2 mm   approx. 8.6 mm    
Pad thickness, rear Wear limit 2 mm   approx. 8.9 mm    
Brake disc thickness, front New   40 mm + 0.1 mm - 0.1 mm
Brake disc thickness, rear New   30 mm + 0.1 mm - 0.1 mm
Brake disc wear limit, front Brake disc minimum thickness (wear limit) is stamped on the brake disc hub. Example: Min. Th. 37.7 mm   (Read value on brake disc hub) XX.X mm    
Brake disc wear limit, rear Brake disc minimum thickness (wear limit) is stamped on the brake disc hub. Example: Min. Th. 29.7 mm   (Read value on brake disc hub) XX.X mm    
Peak-to-valley surface roughness of brake disc New   0.006 mm    
Wear limit: Surface changes in front and rear brake discs Wear limit: Connected surface fracture > 1 cm2 and/or surface roughness of brake disc > 80 micrometer. Replace PCCB brake discs on both sides of the axle.   Values and procedure for: 46 51 02 Checking front PCCB brake discs/46 54 02 Checking rear PCCB brake discs.    
Lateral runout of brake disc, maximum     0.03 mm    
Lateral runout of wheel hub, maximum     0.02 mm    
Lateral runout of brake disc when installed, maximum     0.07 mm    
Pushrod play Not adjustable        
Parking brake (foot-operated parking brake) Drum brake acting mechanically on both rear wheels        
Parking-brake drum Ø Wear limit 211 mm   210 mm    
Brake shoe width     30 mm    
Brake pad thickness Wear limit 1 mm   3 mm