Brake System: General Description: Specification

2014 Subaru Outback 2.5i, Standard TransSECTION Specification
Front disc brake Size 16-inch type 17-inch type
Type Disc (Floating type, ventilated)
Effective disc diameter mm (in) 244 (4.61) 261 (10.28)
Disc thickness x Diameter mm (in) 24 x 294 (0.94 x 11.57) 30 x 316 (1.18 x 12.44)
Effective cylinder diameter mm (in) 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 16-inch type
Type Disc (Floating type, solid) Disc (Floating type, ventilated)
Effective disc diameter mm (in) 250 (9.84) 255 (10.0)
Disc thickness x Diameter mm (in) 10 x 286 (0.39 x 11.26) 18 x 290 (0.71 x 11.42)
Effective cylinder diameter mm (in) 38.1 (1.500) 40.4 (1.591)
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) 95.5 x 34.8 x 11.0 (3.759 x 1.370 x 0.433)
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 FMVSS No. 116, DOT3, or DOT4
CAUTION:
  • Avoid mixing brake fluid of different brands to prevent fluid performance from degrading.
  • When filling with brake fluid, be careful not to allow any dust to enter the reservoir.
  • Use new SUBARU genuine brake fluid when replacing or refilling the fluid.
NOTE: Refer to SPECIFICATION .
Item Standard Limit
Front brake Pad thickness 16-inch type 11 (0.43) 1.5 (0.059)
mm (in) 17-inch type 11 (0.43) 1.5 (0.059)
Disc thickness 16-inch type 24 (0.94) 22 (0.87)
mm (in) 17-inch type 30 (1.18) 28 (1.10)
Disc runout mm (in) - 0.05 (0.0020)
Rear brake (disc type) Pad thickness Solid disc 9.0 (0.354) 1.5 (0.059)
mm (in) Ventilated disc 11 (0.43) 1.5 (0.059)
Disc thickness Solid disc 10 (0.39) 8.5 (0.335)
mm (in) Ventilated disc 18 (0.71) 16 (0.63)
Disc runout mm (in) - 0.05 (0.0020)
Parking brake Inside diameter mm (in) 190 (7.48) 191 (7.52)
Lining thickness mm (in) 3.5 (0.14) 1.5 (0.059)
Brake pedal force N (kgf, lbf) Fluid pressure kPa (kgf/cm2 , psi)
Brake booster Brake fluid pressure with engine stopped 147 (15, 33) 553 (5, 77)
294 (30, 66) 1551 (16, 225)
Brake fluid pressure with engine running and vacuum pressure at 66.7 kPa (500 mmHg, 19.69 inHg) 147 (15, 33) 6177 (63, 896)
294 (30, 66) 11273 (115, 1635)
Brake pedal Free play mm (in) 0.5 - 2 (0.02 - 0.079) [When pulling the brake pedal upward with a force of less than 10 N (1 kgf, 2 lbf)]
RENDER: 1.0x

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When to See a Mechanic

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

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