OBP Master Cylinder 0,625″ (Girling) Without Reservoir

Description

OBP Master Cylinder 0,625″ (Girling) Without Reservoir

Quality Product from OBP OPTIMUM BALANCE PRODUCTS!

Master Brake Cylinder, same as Girling.

All OBP pedal boxes and hydraulic handbrakes come with these high quality cylinders!

The cylinder has standard dimensions for sizes, bolt holes and brackets and more.

Technical Data:

Cylinder size: 0,625″ (5/8″) / 15,87 mm
Length (body): 106 mm
Total length with pressure rod: ~200 mm
CC-measurement (Center to Center) between the mounting holes: 57 mm
Max stroke: 30 mm
Pumpable fluid per mm stroke: 197 mm3
Max pumpable fluid: 5910 mm3
Mounting details: Brake nipple (IN and OUT), T-adapter and Brake light sensor

Sold separately.

TIPS when choosing the size of the brake cylinder!

If you want to get an idea of ​​how small of a brake cylinder you can use for the brake calipers then you need to know how much brake fluid is required to move the piston a certain distance. The first thing to do is measure up the piston area in the brake caliper, this is done according to the following formula: Pi x Radius x Radius = Cubic Millimeters.

If we take a 54 mm piston as an example then the piston area is: Pi (3.14) x 27 mm x 27 mm = 2289 square millimeters = 2289 cubic millimeters per millimeter stroke (for it to move 1 mm distance).

Moreover, 2289 cubic millimeters = 0.02289 deciliters.

The calculation above must be multipled for the number of pistons you have!

Note! If you have a single piston caliper, it counts as a two piston caliper! However, if you have a caliper with multiple pistons with different piston sizes, you calculate the piston area separately on the different sizes.

Summary: In the above example, therefore, a single piston caliper (with 54 mm piston) needs 2289 cubic millimeters of brake fluid to move 1 mm. If you connect two single piston calipers to a main cylinder, you have four brake pistons which then becomes 2289 mm3 x 4 = 9156 cubic millimeters to move the brake caliper pistons 1 mm.

NOTE! Important to remember! Usually, the total stroke of the main cylinder is not used in a brake bias system, some margin is good to have.