2008 Subaru Outback Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Section 137 (Brake System): General Description: Specification

WARNING: This page is about a different car, the 2007 Subaru Outback and 2007 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
BRAKES GENERAL SPECIFICATIONS

Model 2.5 i 2.5 i-LTD, OUTBACK 2.5 i,-LTD, OUTBACK 3.0 R,-LTD, -LLB 2.5 GT, -LTD, OUTBACK 2.5 GT
Front disc brake Size With 15" Wheel With 16" Wheel With 17" Wheel
Type Disc (Floating type, ventilated)
Effective disc diameter mm (in) 228 (8.98) 244 (4.61) 261 (10.28)
Disc thickness x Outer diameter mm (in) 24 x 277 (0.94 x 10.91) 24 x 294 (0.94 x 11.57) 30 x 316 (1.18 x 12.44)
Effective cylinder diameter 42.8 (1.685) x 2
Pad dimensions (length x width x thickness) mm (in) 117.8 x 50.5 x 11.0 (4.638 x 1.988 x 0.433) 130.0 x 53.5 x 11.0 (5.118 x 2.106 x 0.433)
Clearance adjustment Automatic adjustment
Rear disc brake Size With 15" Wheel
Type Disc (Floating type, solid) Disc (Floating type, ventilated)
Effective disc diameter mm (in) 238 (9.37) 254 (10.0)
Disc thickness x Outer diameter mm (in) 10 x 274 (0.39 x 10.79) 18 x 290 (0.71 x 11.42)
Effective cylinder diameter mm (in) 38.1 (1.500)
Pad dimensions (length x width x thickness mm (in)) 92.0 x 33.0 x 9.0 (3.622 x 1.299 x 0.354) 82.4 x 33.7 x 9.0 (3.244 x 1.327 x 0.354)
Clearance adjustment Automatic adjustment
Master cylinder Type Tandem
Effective diameter mm (in) 23.8 (15/16)
Reservoir type Sealed type
Brake fluid reservoir capacity cm3 (cu in) 205 (12.51)
Brake booster Type Vacuum suspended
Effective diameter mm (in) 208 + 229(8.19 + 9.02)
Brake line Dual circuit system
Brake fluid
CAUTION:
  • Avoid mixing brake fluid of different brands to prevent fluid performance from degrading.
  • When filling brake fluid, be careful not to allow any dust into the reservoir.
  • Use fresh brake fluid when replacing or refilling the fluid.
 FMVSS No. 116, DOT3
NOTE: For parking brake specifications, < Ref. to SPECIFICATION , General Description. >
BRAKES GENERAL SPECIFICATIONS

Item Standard value Limit
Front brake Pad thickness mm (in) Except With 17" Wheel 11 (0.43) 1.5 (0.059)
With 17" Wheel 11 (0.43) 1.5 (0.059)
Disc thickness mm (in) Except With 17" Wheel 24 (0.94) 22 (0.87)
With 17" Wheel 30 (1.18) 28 (1.10)
Disc runout mm (in) - 0.05 (0.0020)
Rear brake (Disc type) Pad thickness mm (in) Solid disc 9.0 (0.354) 1.5 (0.059)
Ventilated disc 9.0 (0.354) 1.5 (0.059)
Disc thickness mm (in) Solid disc 10 (0.39) 8.5 (0.335)
Ventilated disc 18 (0.71) 16 (0.63)
Disc runout mm (in) - 0.05 (0.0020)
Parking brake Inside diameter mm (in) 170 (6.69) 171 (6.73)
Lining thickness mm (in) 3.2 (0.126) 1.5 (0.059)
Lever stroke 5 - 6 notches/200 N (20 kgf, 45 lb)
BRAKE BOOSTER GENERAL SPECIFICATIONS

Brake pedal force N (kgf, lb) Fluid pressure kPa (kg/cm2 , psi)
With 15" Wheel With 16" Wheel With 17" Wheel
Brake Booster Brake fluid pressure without engine running 147 (15,33) 545 (6, 79)
294 (30, 66) 1564 (16227)
Brake fluid pressure with engine running and vacuuming at 66.7 kPa (500 mmHg, 19.69 inHg) 147 (15,33) 6003 (61,871) 5381 (55, 780) 4963 (51, 720)
294 (30, 66) 11273 (115, 1635) 10982 (112, 1593) 10055 (103, 1458)
BRAKE PEDAL GENERAL SPECIFICATIONS

Brake pedal Free play mm (in) 0.5 - 2(0.02 - 0.08)
[When pulling the brake pedal upward with a force of less than 10 N (1 kgf, 2 lb).
Factory Service Tools

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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