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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 1145 (Abs Guided Routine Testing) >> Pinpoint Tests >> Pinpoint Test AH: Brake Booster Vacuum Supply Faults >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
  1. AH1: CHECK THE ABS MODULE DTCS 
    • Ignition ON, engine OFF.
    • Carry out the ABS self-test.
    • Is DTC C0047:xx or C101A:xx also present in the ABS module? 
    Yes No
    If DTC C101A:xx is present, GO to PINPOINT TEST CA .
    If DTC C0047:xx is present, GO to PINPOINT TEST C .    		 Go to  AH2.
  2. AH2: CHECK FOR VACUUM LEAKS 
    • Ignition ON, engine running.
    • Inspect the vacuum hose and each hose connection from the vacuum pump to the brake booster for leaks.
    • Are any vacuum leaks found? 
  3. AH3: CHECK THE VACUUM PUMP OUTPUT 
    • Ignition OFF.
    • Disconnect the vacuum hose from the brake booster.
    • Connect a vacuum gauge to the vacuum hose.
    • Ignition ON, engine running.
    • Monitor the vacuum gauge.
    • Does the vacuum gauge display greater than 600 mBar (18 In-Hg)? 
    Yes No
    INSTALL a new brake booster. REFER to POWER BRAKE ACTUATION - BRAKE BOOSTER . INSTALL a new vacuum pump. REFER to the appropriate procedure in POWER BRAKE ACTUATION - BRAKE BOOSTER .
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