Having Issues with my Hydraulic Handbrake

Hi Everyone.

I recently installed an IRP Hydraulic handbrake on my Skyline R32, I installed the suicide way, Where I separate the front from the rear brakes, the front are with the foot pedal, and the rear with the handbrake only. But my handbrake is looking the Brake way back, I need to push it with all my power, but what I need is just one touch.

Any Guess what should I do? I've already tried bleeding many times using different methods.

Assuming bleeding isn't your problem. If the lever is firm, then it's not a bleeding problem.

Can you fit a smaller master cylinder to the handbrake? That will increase the pressure (at the expense of lever travel), and decrease the force.

You could also increase the leverage your hand brake handle has to the master cylinder. Again, more handle movement, but higher force to the brakes.

Lastly, can you use a softer rear brake pad?

As david sair, smaller master cylinder for more line pressure, longer lever and/or better operating angle for greater leverage and force to the master cylinder, "softer" or rather higher co-efficient of friction rear brake pads. Other options are larger rear calipers - or rather the bore area, larger rear discs that will allow the calipers to be mounted further from the axle centre - the greater mean radius will increase the 'leverage' on the disc, or get a lot of gym time in to build your arm strength up ;-)

All in all, the smaller bore master cylinder is generally the easiest and cheapest option.

Forgot. You can also purchase in-line (AKA remote) brake boosters/servo's that can be plumbed into the rear brake line, but that's more if you can't get the other options to work as they can be quite expensive, and will need a reliable vacuum source - possible a vacuum pump and reservoir. The good news, though, is they're not that uncommon and you should be able to source one in your country quite readily.

They use the pressure from the master cylinder to activate the assistance, rather than a direct mechanical linkage. https://mgaguru.com/mgtech/brakes/bt201k.htm

They're also used for some hydraulic clutch systems, where the pedal forces would be otherwise too high. I think the Maserati Bora was the first I read of that used it that way.

Hi, I finally Got a solution to My Issue

first I changed all the Lines of my Rear Brakes, Second I changed the the Master Cylinder, I was Using 0.625, then I put 0.75 and lastly I changed my Brake Pads, put softwr Ones (EBC Yellow Stuff).

Thank You