TRP HY/RD Cable-Actuated Hydraulic Disc Brake $149.95
Cable actuated hydraulic disc brakes had a short burst of popularity during the late '90s because they were compatible with the existing mountain bike levers on the market. Given the combination of shifter and brake levers on our road bikes, Cable-Actuated Hydraulic Disc Brakes make the most economical sense to achieve better power and modulation. TRP's HY/RD has thoroughly tested to bring this technology up to speed and back to the cycling market.
The HY/RD is compatible with all existing cable-actuated systems, saving you major coin over fully-hydraulic designs that require new shift levers. It also reduces clutter at the bars by locating the hydraulic mechanism at the caliper. The HY/RD features automatic pad wear adjustment so braking is always consistent and it uses pads that are compatible with Shimano M525/M515 brakes, so replacements are always easy to find.
The HY/RD comes with semi-metallic pads that work well in dry conditions but may wear quickly in wet/muddy conditions. If you plan on CX riding an upgrade to full metallic is recommended, but they will be slightly louder. The calipers weigh under 200 grams and are available in Black anodized or polished finishes. You can chose 160mm or 140mm rotors, and the calipers are post mount, but IS hardware is included.
Reviews & Community
Air in brakes? Mineral Oil Bleed Kit
- Familiarity: I've used it once or twice and have initial impressions
When the call arises and you think you have air in your HYRD brakes you should have on hand a bleed kit with TRP approved mineral oil whcih is compatible with these brakes. Note: Do not use DOT 5.1 brake fluid with these brakes.
As of this review Competitive Cyclist did not sell Tektro bleed kits so here is the link to where you can purchase one
You will also find a helpful instructional video from TRP on:
"How To Bleed TRP HY/RD Brakes"
Read the Tech Bulletin
- Familiarity: I've put it through the wringer
I just found there is a Technical Bulletin on the TRP HYRD Disc Brakes.
HYRD TRP owners who received and have these installed on their bikes starting from June 01, 2013 to the current date should check the adjustment of their brakes! Brakes improperly adjusted are potentially dangerous.
The technical BULLETIN READS AS FOLLOWS:
"The HYRD brake system is an open hydraulic brake designed for use on single rider bicycles. The purpose of the open hydraulic system is to allow the pistons to compensate for pad wear. Each time the brake is released, the piston opens up the reservoir, allowing more oil into the caliper if needed. Only a properly set-up brake will allow the piston to retract fully ensuring that your brakes can account for worn pads.
To check if your brakes have been set-up and are operating correctly, examine the Lock Knob feature next to the cable actuator arm. If the Lock Knob can be threaded into arm, then this means the actuator arm is in the correct position and the hydraulic system is open. If the Lock Knob will NOT thread into the actuator arm or is very difficult, this means that the actuator arm is preventing the piston
from returning fully and has closed off the reservoir port. This prevents the brake to compensate for pad wear.
To remedy this - follow the cable installation and adjustment instructions in the HYRD Owner?s Manual. DO NOT RIDE A BIKE WITH A BRAKE IN THIS CONDITION IT COULD CREATE A POTENTIALLY DANGEROUS SITUATION, PARTICULARLY WITH WORN PADS. The barrel adjuster is intended to fine tune cable tension to take up cable slack that some people find difficult to remove when installing the cable. The barrel adjuster has a 1.5 turn limit before the system is closed off. When using the barrel adjuster, check that the Lock Knob will still thread into the actuator arm (with a brake lever in the released state.)"
Be Prepared-Disc Brakes Squeal When Wet
- Gender: Male
- Familiarity: I've put it through the wringer
August 2014 Update:
Replace TRP disc Pads with SwissStop 15 disc pads.
Purchase SwissStop Brake Silencer at Amazon
(Competitive does not sell this.)
Results: All squealing eliminated in all conditions, and maximum braking power realized.)
I just recently moved from traditional road bike brakes to the TRP cable acutated hydraulic brakes. I like the disc brakes but I was unaware that disc brakes tend to squeal and lose their effectiveness when wet or if they get contaminated with dirt or other foreign substances. The remedy is to first clean both the rotors and the disc pads themselves with isopropyl alcohol and then use a paste called Squealout to minimize and delay future squealing. You can purchase Squealout directly from Amazon
(Competitive unfortunately does not carry this product as of this review), or you can go directly to www.squealout.com
For instructions as to how to clean and apply this paste to disc brakes go to this Youtube instructional video.