Brake caliper HOPE RX4+, Flat Mount 34mm, red

• the HOPE RX4+ caliper is made as an extension option for your existing brake levers
• the HOPE RX4+ caliper is available in a version for mineral oil but also DOT brake fluid
• slim 4-piston lightweight design
• one-piece metal construction creates a stiffer caliper that increases braking performance
• pads can be removed from the caliper from both the top and bottom
• caliper is made from one piece of CNC machined 2014 T6 aluminum
• improved brake line connection
• 2 types of pads included (Road blue + All Conditions red)

Dimensions

• piston diameter (small) = 14 mm
• piston diameter (large) = 16 mm
• spacing between brake caliper mount for attaching to frame / fork / adapter = 34 mm

Weight

• caliper HOPE RX4+ Flat Mount 34 mm = 81 g (without brake pads and hose fittings)
• brake pads HOPE = 26 g (spring + locking pin + R-clip)
• hose fittings = 5 g (olive + hose insert + shroud nut + brass seal)
• bolt for tightening to frame / fork = 14 g (2x M5 bolt + 6x washer)

Connecting and installing the hose to the HOPE RX4+ caliper

Before attaching the HOPE RX4+ caliper, remove the original caliper and hose fitting at the caliper. Always use the original HOPE fittings to connect the hose to the HOPE RX4+ caliper! The fittings for connecting the hose to the caliper are included in the caliper package. Install the HOPE fittings on the original hose and connect to the caliper according to the instructions supplied with the caliper. If you are unsure, have a professional service technician or Your HOPE brake dealer install the caliper!

HOPE Flat Mount Adapter Selection

Adapters for attachment to fork / bike frame, not included! For the correct choice of adapter for your bike and disc diameter, we recommend following the selection guide in the HOPE RX4+ Caliper Selection Guide.

Caliper compatibility for mineral oil

The components for the RX4+ mineral oil caliper are always marked in red (e.g. in the spare parts schedule). The seal supplied in the package with the caliper is also in red color. The caliper for mineral oil has the letter M engraved on the piston and is compatible with brake models:

• Shimano Dura Ace Di2 R9170
• Shimano Dura Ace R9120
• Shimano Dura Ace R9170
• Shimano Dura Ace R9200
• Shimano Dura Ace R9270
• Shimano Ultegra Di2 R8020
• Shimano Ultegra Di2 R8070
• Shimano Ultegra Di2 R8100
• Shimano Ultegra Di2 R8170
• Shimano 105 Di2 R7170
• Shimano 105 R7020
• Shimano Di2 R785
• Shimano RS685
• Shimano GRX RX810
• Shimano GRX RX820
• Shimano GRX RX600
• Shimano GRX RX400
• Shimano GRX RX815 Di2
• Shimano GRX RX817 Di2
• Campagnolo Ekar
• Campagnolo Super Record
• Campagnolo Record
• Campagnolo H11

Caliper compatibility for DOT brake fluid

The parts for the RX4+ caliper for DOT brake fluid are always marked in black (e.g. in the spare parts diagram). The seal supplied in the package with the caliper is also in black color. The caliper for mineral oil has the letter D engraved on the piston and is compatible with brake models:

• SRAM Red eTap AXS
• SRAM Red
• SRAM Force eTap AXS
• SRAM Force
• SRAM Rival
• SRAM Rival eTap AXS
• SRAM Apex
• SRAM S900

Contents of the package

• 1x caliper HOPE RX4+ Flat Mount 34 mm (for desired brake fluid)
• 1x brake pads HOPE Road (blue) for a road bike
• 1x brake pads HOPE All-Conditions (red) for gravel or cyclocross
• 2x M5 bolt for attaching the caliper to the bike frame / fork
• 6x bolt washer
• 1x HOPE secure R-clip
• 1x brake pads sercure pin
• 1x brake pads spring
• 1x olive
• 1x hose insert
• 1x hose srhoud nut
• 1x hose insert brass seal
• 2x bleed block insert for HOPE RX4+ caliper

Important information

• Read the following warnings carefully!
• Failure to follow these warnings may result in injury or death!
• Failure to follow the warnings below may void your warranty!

WARNING!

We recommend combining HOPE RX4+ caliper with HOPE Floating or HOPE Floating Road discs (default width 1.8 mm).

The minimum thickness (disc wear limit) is 1.5 mm. Do not exceed the minimum disc thickness!

WARNING!

For proper installation of the brake, carefully read the manual supplied with each brake!
Observe the specified maximum tightening torques for all HOPE RX4+ caliper components!

WARNING!

For the RX4+ brake caliper version for DOT fluid, use DOT 5.1 brake fluid (or DOT 4) as the brake medium.

For the RX4+ brake caliper version for mineral oil, use mineral oil as the brake medium.

Never mix different types of brake fluid inside the brake! Mixing different types of fluid can damage the seals, and the brake will need to be completely cleaned and resealed!

Never mix up the type of brake fluid (DOT 5.1 or DOT 4 with mineral oil - and vice versa) inside the brake! Mixing them up will damage the seals and the brake will need to be completely cleaned and resealed!

WARNING!

To ensure proper brake performance, it is always necessary to perform the so-called bed-in process, i.e., the process of pre-seizing the pads and discs.

The process is as follows. Accelerate the bike to approx. 20 km/h and then brake to a speed of approx. 5 km/h. Repeat the process at least 20 times (a maximum of 30 times is sufficient) for each brake (front and rear) separately! After this process, the pads should be bedded-in (slightly worn), the disc should be slightly worn (sanded), and the brake should have optimal braking performance, which will increase slightly over time with each meter braked (not traveled). This process will ensure high-quality and proper brake performance.

WARNING!

Sintered / metallic brake pads with bedding-in up to 2x as long as organic pads! With sintered pads, pay extra attention to the bed-in process before using the pads, which is much more important with this type of pad.

How to bleed the HOPE RX4+ caliper for mineral oil (Shimano / Campagnolo)

How to bleed the HOPE RX4+ caliper for DOT brake fluid (Sram)