ISR Front Brake & Clutch Master Cylinders

These radial master cylinders from ISR really are a work of art! Machined from billet aluminium and incorporating many unique design features, these work as good as they look.

The adjustable lever ratio means that you can tailor the feel of your front brakes exactly to suit your preference. The ingenious design means that these can be used as either a front brake or clutch master cylinder - simply un-bolt the lever assembly and spin round to suit - and in a race crash damage situation this can also mean that the lever assembly can often be replaced without disconnecting the brake line or bleeding the cylinder.

- Adjustable ratio - provides min/max piston travel of 6.7 to 14.3mm
- Span/reach adjustable lever with comfortable profile
- Integral nipple for rapid bleeding after assembly/servicing
- Clear anodised, corrosion resistant finish
- Unit can be configured to be brake or clutch master cylinder
- Suitable for 22mm handlebars
- Lever style matches ISR Cable Clutch unit
- Ready to connect to your bike's standard/original remote fluid reservoir (except Brembo O.E.M. as used on Aprilia & Ducati)

Can be supplied with optional single or double brake line banjo bolt and washers - with integral hydraulic brake light switch for road/street bikes (please select below).

Please also select your required bore size:
- 15.87 mm for bikes with twin 4 piston radial front calipers, or a single 4 piston front caliper
- 17.50 mm for bikes with twin 6 piston caliper, or older-style non-radial 4 piston front calipers

If you are building a special or simply want to clean up your handlebars, we have the unique range of ISR electrical switchgear - which very neatly bolts on to the back of your master cylinder (and/or cable clutch) replacing the original 4-bolt clamp, taking up less space. See full range of switches listed below on this page.

Click here for more information on ISR...

These radial master cylinders from ISR really are a work of art! Machined from billet aluminium and incorporating many unique design features, these work as good as they look.

The adjustable lever ratio means that you can tailor the feel of your front brakes exactly to suit your preference.

- Adjustable ratio - provides min/max piston travel of 6.7 to 14.3mm
- Span/reach adjustable lever with comfortable profile
- Integral nipple for rapid bleeding after assembly/servicing
- Clear anodised, corrosion resistant finish
- Unit can be configured to be brake or clutch master cylinder
- Suitable for 22mm handlebars
- Lever style matches ISR Cable Clutch unit

Can be supplied with optional single or double brake line banjo bolt and washers - with integral hydraulic brake light switch for road/street bikes (please select below).

Please also select your required bore size:
- 15.87 mm for bikes with twin 4 piston radial front calipers, or a single 4 piston front caliper
- 17.50 mm for bikes with twin 6 piston caliper, or older-style non-radial 4 piston front calipers

ISR part numbers: 21-012-OA, 21-012-OB, 21-012-OC, 21-012-OD

If you are building a special or simply want to clean up your handlebars, we have the unique range of ISR electrical switchgear - which very neatly bolts on to the back of your master cylinder (and/or cable clutch) replacing the original 4-bolt clamp, taking up less space. See full range of switches listed below on this page.

Click here for more information on ISR...

These non-radial master cylinders from ISR are an ideal upgrade for retro or custom bikes. Machined from billet aluminium and incorporating many unique design features, these work as good as they look.

The adjustable leverage feature means that you can tailor the feel of your front brakes to suit your preference.

- Adjustable leverage
- Span/reach adjustable lever with comfortable profile
- Clear anodised, corrosion resistant finish
- Available as matching brake & clutch units
- Lever style matches ISR Cable Clutch unit

Can be supplied with optional single or double brake line banjo bolt and washers - with integral hydraulic brake light switch for road/street bikes (please select below).

Available in two bore sizes:

• 14.00 mm for bikes with twin two piston front calipers, or a single 2 or 4 piston front caliper
• 17.50 mm for bikes with twin 4 or 6 piston calipers

Click here for more information on ISR...

These non-radial master cylinders from ISR are an ideal upgrade for retro or custom bikes. Machined from billet aluminium and incorporating many unique design features, these work as good as they look.

The adjustable leverage feature means that you can tailor the feel of your front brakes to suit your preference.

- Adjustable leverage
- Span/reach adjustable lever with comfortable profile
- Clear anodised, corrosion resistant finish
- Available as matching brake & clutch units
- Suitable for 25.4mm/1-inch handlebars
- Lever style matches ISR Cable Clutch unit

Can be supplied with optional single or double brake line banjo bolt and washers - with integral hydraulic brake light switch for road/street bikes (please select below).

Available in two bore sizes:

• 14.00 mm for bikes with twin two piston front calipers, or a single 2 or 4 piston front caliper
• 17.50 mm for bikes with twin 4 or 6 piston calipers

Click here for more information on ISR...

For those who fit an ISR Brake Master Cylinder and want a matching cable clutch lever unit or for those who simply need to adjust the span of their cable clutch lever - this is THE product.

- Takes standard 3.5mm clutch cables
- Adjustable lever reach
- Linear cable travel/pull 12mm
- 8.75mm cable end hole diameter
- Clear anodised, corrosion resistant finish
- 275g - complete
- Matches ISR hydraulic master cylinders and uses same levers

If you are building a special or simply want to clean up your handlebars, we have the unique range of ISR electrical switchgear - which very neatly bolts on to the back of your cable clutch (and/or master cylinder) replacing the original 4-bolt clamp, taking up less space. See full range of switches listed below on this page.

Weighing in at only 420 Grammes and machined from billet aluminium, this master cylinder is suitable for both road and racing bikes.

The 14mm bore suits the twin piston fixed or large single piston floating rear calipers found on virtually all motorcycles.

It's neat sealed remote reservoir is designed to be easily replaced if damaged in a crash - it also looks trick as well!

- 6mm mounting holes
- 30mm between mounting holes (centre to centre)
- Fluid outlet banjo thread 10 x 1.5 mm
- Choice of fluid outlet position.

To enable you to put the perfect finishing touches to your special - or simply clean up your handlebars and save space - we have a number of very neat and functional handlebar Clamp Switch Assemblies. These fit any of the ISR master cylinder or clutch levers (including the Cable Clutch) and can be wired to your preferred functions.

This version features 1 push button - which could be used for Starter or Horn, etc. - and is suitable for both left or right hand fitments. Max. Current is 25mA for Push Buttons, meaning relays may be required for some applcations.

Available for 22mm (7/8") or 25.4 mm (1") bars - please choose below when ordering.

To enable you to put the perfect finishing touches to your special - or simply clean up your handlebars and save space - we have a number of very neat and functional handlebar Clamp Switch Assemblies. These fit any of the ISR master cylinder or clutch levers (including the Cable Clutch) and can be wired to your preferred functions.

This version features 1 push button - which could be used for Starter or Horn, etc. - and is suitable for both left or right hand fitments. Max. Current is 25mA for Push Buttons, meaning relays may be required for some applcations.

Available for 22mm (7/8") or 25.4 mm (1") bars - please choose below when ordering.

To enable you to put the perfect finishing touches to your special - or simply clean up your handlebars and save space - we have a number of very neat and functional handlebar Clamp Switch Assemblies. These fit any of the ISR master cylinder or clutch levers (including the Cable Clutch) and can be wired to your preferred functions.

This version features one on-off-on Rocker Switch and two Push Buttons - which could be used for Indicators, Starter or Horn, etc. - and is available in 22mm (7/8"), 25.4mm (1") versions and left and right handed fitments. Max. Current for Rocker Switches is 6A and 25mA for Push Buttons, meaning relays may be required for some applcations.

To enable you to put the perfect finishing touches to your special - or simply clean up your handlebars and save space - we have a number of very neat and functional handlebar Clamp Switch Assemblies. These fit any of the ISR master cylinder or clutch levers (including the Cable Clutch) and can be wired to your preferred functions.

This version features one On-Off-On Rocker Switch and one Push Button (Two Button Version Shown Here) - which could be used for Indicator, Starter or Horn, etc. - and is suitable for both left or right hand fitments. Max. Current for Rocker Switches is 6A and 25mA for Push Buttons, meaning relays may be required for some applcations.

Available for 22mm (7/8") or 25.4 mm (1") bars - please choose below when ordering.

To enable you to put the perfect finishing touches to your special - or simply clean up your handlebars and save space - we have a number of very neat and functional handlebar Clamp Switch Assemblies. These fit any of the ISR master cylinder or clutch levers (including the Cable Clutch) and can be wired to your preferred functions.

This version features one On-Off Rocker Switch - which could be used for Lights on-off or Main Beam etc. - and is suitable for both left or right hand fitments. Max. Current for Rocker Switches is 6A meaning relays may be required for some applcations.

Available for 22mm (7/8") or 25.4 mm (1") bars - please choose below when ordering.

To enable you to put the perfect finishing touches to your special - or simply clean up your handlebars and save space - we have a number of very neat and functional handlebar Clamp Switch Assemblies. These fit any of the ISR master cylinder or clutch levers (including the Cable Clutch) and can be wired to your preferred functions.

This version features one on-off Rocker Switch and two Push Buttons - which could be used for Indicators, Starter or Horn, etc. - and is available in 22mm (7/8"), 25.4mm (1") versions and left and right handed fitments. Max. Current for Rocker Switches is 6A and 25mA for Push Buttons, meaning relays may be required for some applcations.

Mirror Mount made from billet Aluminium to compliment your existing ISR products.

Simply replaces the existing clamp on your ISR Master Cylinder.

Available to suit 22mm or 25.4mm diameter handlebars.

Made from billet Aluminium.

Available for 25, 30 & 34mm Caliper Pistons

Made from billet Aluminium.

Replacement blade section (up to the knurled span adjuster) for ISR radial brake/clutch master cylinders.