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SRAM Guide RS (B1) Disc Brake

Item # SRM00B1

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  • Gloss Black, Front/Left ($154.00)
  • Gloss Black, Rear/Right ($154.00)
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Item # SRM00B1


A trusty trail guide.

When dropping into your favorite flowy run, it's nice to know you've got SRAM Guide RS (B1) Disc Brakes along for the ride in the event of an unexpected mid-trail moose sighting or the perfect #autumncolors photo op. The Guide RS utilizes SRAM's Timing Port Closure, with a sliding cup seal and port mechanism that provides immediate actuation with a light pull action. The Swinglink lever facilitates powerful modulation, with a proprietary cam shape that's claimed to eliminate the jarring on/off feeling found in other disc brake systems so you won't get thrown over the bars when you mash on the brakes in front of that moose. As an extra bonus, the lever features Reach Adjust to quickly personalize your setup.

These brakes feature SRAM's new S4 caliper with Bleeding Edge design that updates the fluid and bleed routing for easier brake maintenance, with a bleed adapter plug that seals off the system from air and dust. The new caliper also boasts SRAM's Heat Shield technology, which consists of stainless steel shields that buffer the connection between the pad and caliper body to reduce head transfer to the hydraulic fluid and reduce its temperature by a claimed 20-degrees Celcius under heavy use.

Note that the Guide RS Disc Brake comes in either front/left or rear/right variants, with included lever and caliper configuration. It's compatible with SRAM's Centerline Rotors (sold separately) and uses DOT 5.1 fluid. Additionally, the Guide R is Matchmaker and Matchmaker X compatible, meaning you can run multiple controls off one lever clamp for a more streamlined set-up.

  • 4-piston, dual-diameter S4 caliper with Heat Shield technology
  • Swinglink lever design offers exceptional modulation
  • Includes SRAM's steel-backed organic brake pads
  • Timing Port Closure with sliding cup seal and port mechanism
  • PiggyBack Reservoir uses DOT 5.1 fluid (brakes come pre-bled)
  • Includes either front/left or rear/right lever and caliper configuration
  • Compatible with SRAM Centerline Rotors (not included)
  • Matchmaker and Matchmaker X compatible

Tech Specs

Lever Adjustability:
reach (tool-free)
S4 with Bleeding Edge and Heat Shield
Caliper Adjustability:
adjustable banjo
Mount Type:
post mount
DOT 5.1
Claimed Weight:
385 g
Recommended Use:
mountain bike
Manufacturer Warranty:
2 years

Reviews & Community


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Love em

  • Familiarity: I've put it through the wringer

From spinning laps at deer valley to blasting through chunder in southern Utah, these things will stop you, fast. Love em.

Avg. ride time: 26m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Trusty and reliable

  • Familiarity: I've put it through the wringer

I run these in Utah in the summer, in 100+ conditions. Haven't suffered any sluggishness or failure. They brake solid. I pull, I stop. That's what i am looking for in a braking system.

Work fantastic, just not in high heat

  • Familiarity: I've put it through the wringer

The Guide RS brakes install and setup very easily. While at first it may not feel as if there is much power on tap, there definitely is plenty. The brakes offer great modulation with a slightly softer bight point that allows for you to really control how much brake you are using and prevents you from skidding down the trail. The only issue I have run into is that on long rides in very hot temperatures, the brake seems to lose a lot of the modulation that makes these brakes so good.

Avg. ride time: 2h 20m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

How to Bleed Sram Guide [b1] Brakes

Avg. ride time: 2h 20m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Packs A Punch

  • Familiarity: I've put it through the wringer

I've run Guides on my past 3 bikes and absolutely love them. I think both Shimano and Sram make quality brakes and think that Guides have qualities that I prefer over XT or other Shimano brakes.

First of all, the dual caliper / 4 piston design packs a punch. They're powerful brakes. No question using them on hefty downhill trails.

I like the modulation of the brakes - meaning they gradually give more and more breaking power when you pull the lever more and more. Shimano has a more off/on feel and because of this, I like the Sram Guides.

Easy to bleed. Item number SRM005W and easy to follow along video, even someone not hugely mechanically inclined can follow along!

If you're looking for an upgrade to your brakes, you should absolutely consider Guides as a possibility. There are several levels of Guides and I'd be happy to help find the best ones for you - you can call my direct line 801.204.4547 or email me at

Packs A Punch

Stop on a dime

  • Familiarity: I've put it through the wringer

3 years ago I never would have run a Sram brake on my bike. I was skeptical when Sram introduced the Guide line. After riding several bikes with Sram Guide R, RS, and RSC brakes I was converted. The stopping power on the RS is equivalent to that of a Shimano XT brake but it provides better modulation compared to a Shimano. With modulation you can ensure that you stop when you need to and that you don't just lock your brakes up. For the money these are probably the best stoppers on the market.

Good brakes and easy to install

  • Familiarity: I've used it several times

I've only had them a couple weeks now but so far they've been great

Thanks for the review Kristin! Super helpful to get this feedback out to the community.