Motor Trike Rear additional brake caliper upgrade - what master cylinder to use?

[AndyCapp666]

Motor Trike Rear additional brake caliper upgrade - what master cylinder to use?

I see from a few posts on here that folks have fitted additional rear brake calipers to their MT and prob a few other machines too!

So question is - what large rear master cylinder did you use? Obviously the stock one will not work and you now have double or more the piston volume to move?

Ours is an 08 Goldwing GL1800 and someone put VW Golf GTi rear calipers with hand/parking brake function then fitted and addition 2 x 4-pot calipers for good measure. Result = NO rear brake - piston bottom on in master cylinder before it can move enough fluid.

As a gues as the oem m/cyl is 11/16" / 17.5mm it needs to go up to either a 19mm or better still a 22mm bore cylinder - again preferabley another Nissin unit but strugling to find one.

Anyone help?

 

[Jack Klarich]

3/4 and 7/8 are popular and should be available

For reference, 19 mm=.748 or 3/4 of a inch and 22mm =.864 or 7/8 of a inch.

You may also try a residual check valve in line, unless you already have one

 

[CrystalPistol]

3/4 and 7/8 are popular and should be available

For reference, 19 mm=.748 or 3/4 of a inch and 22mm =.864 or 7/8 of a inch.

You may also try a residual check valve in line, unless you already have one

Sure did help my rear brake feel on our Lehman with drums. I used a 10 psi one because drums have return springs.