Parts for your 1991 Nissan Primera-Brake master cylinder

1991 Nissan Primera Brake Master Cylinder

Technical references confirm the 1991 Nissan Primera (P10) is equipped with a hydraulic brake master cylinder. The Nissan Primera P10 Factory Service Manual (BR – Brakes section), the Infiniti G20 (P10 platform) Service Manual, and Nissan’s FAST electronic parts catalogue (brakes group) all show a tandem master cylinder mounted to the brake booster, feeding dual brake circuits for safety redundancy.

On a 1991 Primera, the brake master cylinder’s job is to turn the driver’s foot pressure on the pedal into hydraulic pressure that operates the front and rear brakes. The tandem design means two separate hydraulic circuits share the same housing, if one circuit loses pressure, the other can still provide stopping power. It sits on the firewall, bolted to the booster, with a translucent reservoir on top so fluid level can be checked at a glance.

As part of regular servicing, it’s smart to keep an eye on fluid level and condition, and to flush the brake fluid every two years (or sooner if the fluid looks dark or the car sees a lot of wet or hilly driving). Use the brake fluid grade shown on the reservoir cap or owner’s manual—typically DOT 3 for early ’90s Nissans, DOT 4 that meets or exceeds DOT 3 can be used in many cases, but never mix with silicone DOT 5.

• Common signs the master cylinder may be tired: a slowly sinking pedal under steady pressure, a spongy feel that doesn’t improve after a proper bleed, brake warning lamp, or fluid weeping at the rear of the master where it meets the booster.

• Replacement tips for a Primera owner or technician:
  • Bench-bleed the new master cylinder before fitting to purge trapped air.
  • Protect paintwork—brake fluid is corrosive—use rags and water spray to rinse spills.
  • Use proper flare-nut spanners on the brake lines to avoid rounding fittings.
  • If ABS is fitted, follow the ABS-specific bleeding sequence in the service manual.
  • Tighten mounting nuts and line fittings to factory torque and perform a careful road test in a safe area.

Done right, a fresh, correctly bled master cylinder restores a firm, confidence-inspiring pedal. If there’s any doubt about diagnosis or bleeding, a qualified brake specialist is the safest bet.

Popular questions

What brake fluid should be used in a 1991 Nissan Primera?
Nissan typically specified DOT 3 for early ’90s models. Many owners use quality DOT 4 that states compatibility with DOT 3 systems. Always check the reservoir cap or owner’s manual for the correct grade, and never use silicone DOT 5. Refresh the fluid every two years to keep moisture and corrosion at bay.

Does ABS change the bleeding procedure on a 1991 Primera?
Some P10 Primeras were fitted with ABS. If yours has it, follow the ABS bleeding order in the service manual and avoid letting the reservoir run dry. Many systems can be bled without a scan tool, but the sequence and precautions differ from non-ABS models.

How can they tell it’s the master cylinder and not air or a wheel-end leak?
A pedal that slowly sinks with steady pressure—without obvious external leaks at calipers, wheel cylinders or hoses—often points to internal bypass in the master. If the pedal firms up after clamping flexible brake hoses (for diagnosis only, by a pro), that can help isolate the fault. Always repair any leaks first and perform a proper bleed before condemning the master.