SRAM Guide RSC S4 MTB disc brake review

Excellent brakes become exceptional

Our rating 
5.0 out of 5 star rating 5.0
GBP £222.00 RRP
They cost a bit more but the bite point adjustment, creep free reach adjustment and silky smooth lever action make the Guide RSC S4 brakes well worth it

Our review

Pricey but latest updates make them unbeatable for outstandingly consistent braking
Buy if, You want a supremely well modulated set of stoppers
Pros: Excellent reliability, useful bite point adjustment, and now trickle-down tech from the guide ultimate
Cons: Not the lightest or cheapest
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The latest Guide RSC gets all the adjustment you need, plus the latest S4 caliper from the Guide Ultimate to create a superb stopper.


The extra spend over the already impressive Guide RS gets you a bite point adjustment dial that for once actually makes a significant difference to where the pads contact the rotor. Lever reach can also be adjusted externally through an updated, smaller knob with clearer clicks and no creep.

We’ve always been big fans of the distinctive sweep axis of SRAM levers from their close-to-bar pivot. The stiff carbon blade swings silkily on a proper cartridge bearing too, so it starts silky smooth and stays that way even on well-used sets.

The SwingLink actuator cam also gives plenty of pad clearance for scuff-free running but fast engagement and increased power at contact.

New Bleeding Edge porting works superbly to banish bubbles too and Guide family reliability has been relentlessly excellent. Weight is average, so gram counters should wait for the imminent SRAM Level brakes.

From June 2016, the latest versions also get the same S4 calliper as the top-end Guide Ultimate, including remodelled heat-shielded, bi-material pistons, and new seals and shaping for outstandingly consistent control on even the longest, most demanding descents.


The result is consistently rich and impressive modulation that eclipses anything else you’ll find.

Product Specifications


Name Guide RSC S4
Brand SRAM

Weight (kg) 0.438