TL L5-2451cc 2.5L SOHC MFI (1997)
Vacuum Brake Booster Check Valve: Testing and Inspection
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Disconnect the brake booster vacuum hose at the booster.
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Start the engine and let it idle. There should be vacuum. If no vacuum is available, the check valve is not working properly. Replace the brake
booster vacuum hose and check valve, and retest.