Brake Booster Pushrod Clearance Adjustment

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required

Booster Piston Holder 070AB-SJA0100

NOTE:

Brake booster pushrod to piston clearance must be checked and readjusted before installing a new master cylinder.
The master cylinder assembly comes with a tool that must be used to adjust the clearance between the brake booster pushrod and the master cylinder piston.
Use only the tool that comes with the new master cylinder to check the pushrod clearance. Do not use any other tool.
Make sure to discard the tool supplied with the master cylinder after its use.
The brake booster must be installed on the vehicle before doing the pushrod clearance adjustment.
If the booster is removed, check the pushrod length (A) as shown. If the length is incorrect, loosen the pushrod locknut (B), and turn the clevis (C) in or out to adjust.

Fig 1: Checking Pushrod Length
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Remove the master cylinder (see MASTER CYLINDER REPLACEMENT ).
Measure the clearance between the tool (A) supplied with master cylinder and brake booster pushrod (B). Make sure that the tool is lying flat against the surface (C) of the brake booster, and that the tip of the tool contacts the pushrod. If the tool will not lie flat (D) or there is a gap (E) between the tool and the pushrod, go to step 3. If the clearance is correct, go to step 4.

Fig 2: Measuring Clearance Between Tool With Master Cylinder And Brake Booster Pushrod
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the clearance is incorrect, use the booster piston holder to hold the pushrod (A) and turn the adjusting screw (B) clockwise to move inward or counterclockwise to move outward.

Fig 3: Turning Adjusting Screw Clockwise
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the master cylinder (see MASTER CYLINDER REPLACEMENT ).