If the effort on the pedals during braking has noticeably increased compared to normal, check the brake booster with the vehicle stationary.
You will need: flat blade screwdriver, rubber bulb.
1. With the engine off, press the brake pedal five or six times. Keeping the brake pedal depressed, start the engine. The brake pedal should move forward. If it doesn't, check...
2.... the tightness of the vacuum hose tip on the intake pipe fitting...
3.... and the fit of the vacuum hose check valve fitting in the vacuum booster housing.
Note. Do not loosen fasteners or damage parts. Damaged parts must be replaced.
4. To check the check valve, remove the vacuum hose assembly, for which...
5.... squeeze the retainer and disconnect the vacuum hose from the intake pipe fitting..
6.... use a screwdriver to remove the check valve fitting from the vacuum booster housing...
7.... and remove the hose assembly with the check valve.
8. Put on the check valve fitting (with which the valve is inserted into the amplifier) rubber bulb and squeeze it. The air from the pear should exit through the valve.
9. Release the pear. If it remains in a compressed state, then the valve is working. Otherwise, replace the check valve. In the absence of a pear, you can purge the valve with your mouth.
10. Install the parts in the reverse order of removal.