FRONT BRAKE

The 3 1/2 forum

Re: FRONT BRAKE

Postby BumbleBee » 31 Jul 2020 12:08

vincent3664 wrote:He said the powder coating on the disc carrier may be to blame.


The face of the disc carrier that bolts against the wheel will (should) have been machined true to the disc surface within fractions of a millimetre. Covering it with powder coating is going to upset the fit big time, as well as coase problems when the disc gets hot. It's good engineering practice not to powder coat such surfaces. They are usually masked off before sending to the powder coaters.

Gary and Anne
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Re: FRONT BRAKE

Postby BumbleBee » 31 Jul 2020 12:24

Steve Brown wrote:The improvements in feel is down to the ratios! The smaller the master cylinder piston the greater the force transferred to the caliper pistons, for the same amount of lever pressure.
That's why fitting a second disc transforms the power and feel from that original master cylinder.
If you try and pump a larger volume of fluid it takes more effort than if you pump a small volume. Honest. There are better explanations by people with proper engineering qualifications but I can't even read them without getting a headache.

As for the replacement pistons in the last but one post's pic, the improvement is maybe down to the better fitting, non worn pistons and the fact you cleaned all the gunge out and replaced the seals?


Putting the maths aside, feel is mostly about how well the slave cylinders respond to the changes in force at the master cylinder. So good feel is a byproduct of reducing "sticktion" in the system and having good "linear" friction characteristics between whatever you are using for discs and pads. Everything else is is a red herring at least assuming we are talking about "feel".
Power is another conversation altogether.

Gary&Anne
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