1.0a ABS / ESP Bosch 5.3 elements and their location:
1 - modulator pump. Only on vehicles with ESP
2 - modulator pump pressure sensor. Only on vehicles with ESP
3 - return pump relay
4 - relay solenoid valves modulator
5 - modulator and ABS control unit
6 - brake fluid level sensor
7 - ABS sensor gear of the front right wheel
8 - front right wheel speed sensor
9 - ESP control unit
10 - ASR/ESP switch
11 - steering wheel angle sensor
12 - parking brake switch
13 - ABS sensor gear of the rear right wheel
14- rear right wheel speed sensor
15 - rear left wheel speed sensor
16 - ABS sensor gear of the rear left wheel
17 - vehicle rotation speed sensor relative to the longitudinal axis
18 - transverse acceleration sensor
19 - return pump relay
20 - relay solenoid valves modulator
21 - brake warning light
22 - ABS warning light
23 - parking brake warning light
24 - signal light ASR / ESP
25 - brake light switch
26 - front left wheel ABS sensor gear
27 - front left wheel speed sensor
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