No brake pressure after replacing Master cylinder, brake booster and one wheel cylinder all new

Welcome to 2CarPros.

First, open one bleeder at a time starting with the right rear, left rear, right front, and left front. Will they gravity feed? In other words, will brake fluid start to drain out?

Next, did you check the push rod for adjustment issues? Take a look through these directions and the attached pictures.

___________________________________

1991 Honda Civic Sedan L4-1590cc 1.6L SOHC (D16A6) MFI

PUSHROD CLEARANCE
Master cylinder pushrod-to-piston clearance must be checked and adjusted before installing master cylinder.
Fig. 17 Adjusting Pushrod Adjustment Gauge Bolt

Pic 1

1. Using pushrod bolt adjustment gauge No. 07GAG-SE00100 or equivalent, adjust bolt so the top of it is flush with end of master cylinder piston, Fig 17.
2. Install master cylinder rod seal between pushrod bolt adjustment gauge and brake booster.
3. Without disturbing the adjusting bolts position, install gauge upside down on booster and torque nuts to 11 ft. Lbs.
Fig. 18 Measuring Pushrod Clearance

pic 2

4. Connect booster inline with a vacuum gauge and maintain an engine speed that will deliver 20 inches of vacuum, then using a feeler gauge, measure clearance between gauge body and adjusting nut, Fig. 18. Clearance should be.016 inch.
5. If clearance is incorrect, loosen star locknut and turn adjuster in or out to adjust. Hold clevis while adjusting, then tighten star locknut securely.
6. After adjustment, loosen clevis end pushrod locknut and turn pushrod to obtain correct pedal height. Adjust pedal to floor height, to the following specifications:
a. On 1989 Accord, 8.07 inches.
B. On 1990-92 Accord, with manual transmission, 7.48 inches, with automatic transmission, 7.68 inches.
C. On 1989-91 Civic, Civic CRX and Civic Wagon, 6.02 inches.
D. On 1992 Civic, with manual transmission 6.30 inches, with automatic transmission, 6.50 inches.
E. On 1989-91 Prelude, with manual transmission, 7 inches, with automatic transmission, 7.2 inches.
F. On 1992 Prelude, with manual transmission, 6.5 inches, with automatic transmission, 7.32 inches.

____________________________________________-

Let me know if this helps.

Joe

Welcome back:

Honestly, one of two thing is happening. Either the new MC is bad or the pushrod between the brake pedal and MC isn't adjusted properly. Just for curiosity, disconnect one of the lines right at the MC. See if there is pressure when the brake is depressed. Cover the area with a rag so it doesn't spray on you or the vehicle. Have a helper depress the brake pedal while you watch to see what happens. Before you allow the person to release the pedal, put your finger over the port on the MC so it can't suck air back into it.

If there is no pressure at that point, we need to remove the MC and confirm the pushrod is adjusted. If it is, get a different MC. You may have just gotten a bad one. It happens.

Let me know what happens.

Joe

Welcome back:

Let me know what you find.

Joe