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| * A larger master cylinder will generate LESS pressure but the pedal will be STIFFER. Because there is less pressure, you have to push harder on the pedal to make it stop the same. You get more volume (firmer pedal), but less pressure. | * A larger master cylinder will generate LESS pressure but the pedal will be STIFFER. Because there is less pressure, you have to push harder on the pedal to make it stop the same. You get more volume (firmer pedal), but less pressure. | ||
| - | The reason Datsun chose 3/4" had to do with how much leg pressure is required. At 3/4" (given the size of the brakes at the wheels), even a small driver can generate enough force to panic-stop the car. The downside is a bit of pedal travel. | + | The reason Datsun chose 11/16" had to do with how much leg pressure is required. At 11/16" (given the size of the brakes at the wheels), even a small driver can generate enough force to panic-stop the car. The downside is a bit of pedal travel. When they started offering power brakes in the B210, they went to a larger diameter master for decreased pedal travel. That's why when the power booster fails, it is difficult (requires much leg pressure) to stop the car. |
| Vehicles with a brake booster can have larger master cylinders, so that you get a firmer brake pedal with less travel required. But with the booster even a small driver can operate the brakes to maximum force. | Vehicles with a brake booster can have larger master cylinders, so that you get a firmer brake pedal with less travel required. But with the booster even a small driver can operate the brakes to maximum force. | ||
Revision as of 08:57, 12 November 2012
Datsun 1200 used either a single or tandem (safety) master cylinder.
Contents |
Overview
Datsun 1200 used three basic brake master cylinders:
- 11/16 diameter safety split circuit (tandem), used with disc-brake models
- 11/16" safety split circuit (tandem), used with deluxe drum-brake models
- 11/16" single reservoir, used with economy drum-brake models
In Japan, STD trim 1200s used the single, DX used tandem drum, and GL,GX used tandem disc.
All North American 1200s used tandem for disc brakes.
Larger Master Cylinder
Some club members are using a 13/16 master cylinder from the B310. This increases pedal effort, but reduces pedal travel for a "tighter" feel. Discussion: Is anyone running a 13/16 master cyl w/out a booster?
- A larger master cylinder will require more leg pressure, but will require less pedal travel. However, even though you press harder on the pedal, it will not create more pressure at the wheels.
- The size of the master cylinder does not affect front-to-rear brake proportion. Instead, the relative size of the front brakes to the rear brakes sets the proportion.
- A larger master cylinder will generate LESS pressure but the pedal will be STIFFER. Because there is less pressure, you have to push harder on the pedal to make it stop the same. You get more volume (firmer pedal), but less pressure.
The reason Datsun chose 11/16" had to do with how much leg pressure is required. At 11/16" (given the size of the brakes at the wheels), even a small driver can generate enough force to panic-stop the car. The downside is a bit of pedal travel. When they started offering power brakes in the B210, they went to a larger diameter master for decreased pedal travel. That's why when the power booster fails, it is difficult (requires much leg pressure) to stop the car.
Vehicles with a brake booster can have larger master cylinders, so that you get a firmer brake pedal with less travel required. But with the booster even a small driver can operate the brakes to maximum force.
Adjustment
B110 has a non-adjustable master cylinder. When re-installing or after fluid has drained, do the following:
- Perform Brake Bleeding, including "bench bleeding" of the master cylinder.
- Tighten the master cylinder retaining bolts to 1.5-1.8 kg-m (10.8 to 13.0 ft-lb) torque.
- Adjust brake pedal height.
Part Numbers
Master Cylinder (disc brakes)
- WAGNER F96862 $51.79
- A1 CARDONE 111655 (remanufactured) $32.79
- TOKICO Master Cylinder PN 46010-H1006
- TOKICO Master Brake Cylinder (rebuild kit) PN 46010-H1027
TOKICO
- 46020-10611 ASSY-CAP,RESERVOIR
- 46010-H1000 ASSY-CYLINDER,BRAKE MASTER
- 46010-H1005
- 46010-H1006
- 46010-H0100 ASSY-CYL. B/MASTER TANDEM FOR DRUM
1071-
- 46010-H3300 ASSY-CYLINDER,BRAKE MASTER
- 46010-H3100 ASSY-CYLINDER,BRAKE MASTER (TANDEM)
- 46020-E0300 ASSY-CAP,OIL RESERVOIR (NABCO)
- 46020-U0512 Newer CAP
- 46020-U0201 ASSY-CAP,OIL RESERVOIR
Rebuild Kits
Note that Tokico and Nabco internals are different. So while you can interchange the whole Master, a rebuild kit needs the specific kind.
TOKICO REBUILD KIT
- PBR K7859X [for 11/16 cylinders]
- This is a major overhaul kit and supercedes all 11/16 kits.
NABCO REBUILD KIT
- ?