Good afternoon,
this issue is caused by a failing master cylinder, not a brake booster at all.
https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor
https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder
https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system
i attached the procedure for replacing the booster and the master cylinder below for.
brake system (other): brake master cylinder: removal; 2012 my corolla [12/2011 - ]
notice:
make sure to release the vacuum from the brake booster before removing the master cylinder from the brake booster.
disengage the clamp.
remove the 12 bolts and outer cowl top panel.
remove outer cowl top panel (except tmc made)
disengage the clamp and bend the water guard plate rh as shown in the illustration.
disengage the clamp and bend the no. 1 heater air duct splash shield seal.
disengage the clamp.
remove the 12 bolts and outer cowl top panel.
remove suspension tower damper assembly (w/ front strut bar) [ front suspension: front strut bar: removal+ ]
drain brake fluid
disconnect clutch tube (for manual transaxle)
move the clip and disconnect the clutch tube.
remove brake master cylinder sub-assembly
disconnect the connector and disengage the clamp.
using a union nut wrench (10 mm or 12 mm), disconnect the 4 brake lines from the brake master cylinder sub-assembly.
remove the 2 nuts, brake tube way and brake master cylinder sub-assembly.
notice:
the master cylinder requires careful handling. do not allow the master cylinder to receive any impact, such as from being dropped. do not reuse a master cylinder that has been dropped.
do not strike or pinch the master cylinder piston, and do not cause any damage to the master cylinder piston by any other means.
make sure to release the vacuum from the brake booster before removing the master cylinder from the brake booster.
when installing the master cylinder to the brake booster, or when removing the master cylinder from the brake booster, make sure that the master cylinder is kept horizontal or its tip faces downward (the piston faces upward) to prevent the master cylinder piston from falling off.
do not allow any foreign objects to contaminate the master cylinder piston. if a foreign object gets on the piston, remove it by using a piece of cloth and then apply an even layer of lithium soap base glycol grease around the circumference (sliding part) of the piston.
do not use any other type of grease or fluid.
brake system (other): brake booster: removal; 2012 my corolla [12/2011 - ]
make sure to release the vacuum from the brake booster before removing the master cylinder from the brake booster.
disconnect vacuum hose
slide the clip and disconnect the vacuum hose.
remove brake vacuum check valve assembly
remove the vacuum check valve assembly from the brake booster assembly.
remove check valve grommet
remove the check valve grommet from the brake booster assembly.
remove no. 5 front brake tube
using a union nut wrench (10 mm), disconnect the no. 5 front brake tube from the front brake flexible hose lh.
remove the grommet and no. 5 front brake tube from the body.
remove brake booster assembly
disengage the 2 clamps and separate the brake lines from the body.
remove the 4 nuts and brake booster assembly from the body.
do not damage the brake lines or fuel lines.
remove brake booster gasket
remove the brake booster gasket from the brake booster assembly.
remove brake master cylinder push rod clevis
loosen the lock nut and remove the brake master cylinder push rod clevis and lock nut from the brake booster assembly.
Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.
Images (Click to make bigger)
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Friday, March 19th, 2021 AT 1:11 PM
