Two fingers on the lever, dropping into a steep chute I’ve ridden dozens of times. The old Maven had this specific trait where initial engagement required a deliberate squeeze before anything happened. A dead zone, then a wall of power. The B1 doesn’t do that. The lever starts working sooner, and the power builds more gradually, almost linearly. Same raw stopping force at full pull. Completely different feel getting there.

That’s the SwingLink Gold cam, and after running these brakes on sustained technical descents, I think it’s the most meaningful brake modulation improvement SRAM has made since the original Maven launch.

Quick Verdict

Aspect	Rating
Modulation	★★★★★
Raw Power	★★★★★
Lever Feel	★★★★★
Value	★★★★☆
Serviceability	★★★★★

Best for: Aggressive trail and enduro riders who want power with precision, not just power Skip if: You’re happy with your current Maven feel and don’t want to spend on refinement Weight: ~310g per caliper (Maven Ultimate, without rotor) Price: $69–$109 upgrade kit; $249–$349 complete lever/caliper | SRAM

Testing Context

Test brakes: SRAM Maven Ultimate B1 (front and rear), with SwingLink Gold cam Test period: Late February – early March 2026 Trails: Rocky, sustained descents with extended braking zones; steep tech with tight switchbacks; high-speed open flow Bike: Enduro build, 170mm front / 160mm rear Comparison: SRAM Maven A1 (original), Shimano XT 4-piston (same trails, same sessions) Rider weight: 180 lb geared up

I focused testing on situations where modulation matters most: long, steep descents where you’re on the brakes for 30+ seconds at a time, and tight technical sections where the difference between “enough” and “too much” braking force is the difference between cleaning a section and washing the front wheel.

SwingLink Gold: What Changed and Why It Matters

The original Maven’s SwingLink cam gave you power. Lots of it. But the engagement curve was aggressive. SRAM’s own data shows the lever breakaway force was around 8N. That’s the force required to get past the initial dead zone and start generating pad-to-rotor contact. Once past that threshold, power came on fast.

The B1’s SwingLink Gold cam drops that breakaway force to roughly 4.25N, nearly half. That’s not a subtle change in spec sheet terms, and it doesn’t feel subtle on trail.

What it means in practice: on the old Maven, there was a perceptible gap between “lever is moving but nothing’s happening” and “the brake is actively slowing you down.” You learned to work around it. You’d pre-load the lever slightly before a section, or you’d accept the slight delay and ride accordingly. The B1 closes that gap. The lever starts generating braking force almost immediately when you pull it.

The power ramp changes too. Where the A1 went from nothing to a lot quickly, the B1 builds force more gradually through the lever stroke. You get the same maximum power at full pull (SRAM didn’t reduce peak braking force), but the journey from zero to maximum is smoother and more controllable.

On sustained braking into a rutted, off-camber section where I’d normally be pulsing the lever to avoid locking the front wheel, the B1 let me hold a consistent drag. I could maintain a precise amount of braking force without the on/off behavior I’d adapted to on the A1. That’s modulation in the real-world sense, not the marketing sense.

Caliper Changes: 4x18mm Pistons

The A1 Maven caliper used mixed piston sizes (19.5mm and 18mm), a common approach where larger pistons on the trailing side compensate for pad taper under heavy braking. It works, but it creates slightly uneven pad contact under light to moderate pressure.

The B1 switches to four identical 18mm pistons. Same total piston area (close enough to make no measurable difference in maximum force), but more even pad contact across the full rotor face. The practical result is more consistent bite feel, especially when feathering the brakes.

I noticed the difference most on rear brake feel. On moderate descents where I’m dragging the rear lightly, the A1 had a slightly inconsistent zone where one side of the pad would engage before the other. Subtle, and most riders probably wouldn’t identify it consciously, but it showed up as a vaguely “spongy” initial feel. The B1’s even piston sizing cleans that up. The rear brake engagement feels firmer and more predictable from the first millimeter of pad contact.

The Upgrade Kit: $69 and No Bleed Required

This is where SRAM made a smart business move that also happens to be genuinely useful for riders. The SwingLink Gold cam and updated lever internals are available as a backwards-compatible upgrade kit.

What’s in the kit:

• SwingLink Gold cam mechanism
• Updated lever pivot hardware
• T10 Torx tool (though you’ll want your own)

What it costs:

• $69 for the lever-only upgrade (SwingLink Gold cam)
• $109 for kits that include lever blade options

What it requires:

• A T10 Torx wrench
• About 10 minutes
• No bleeding, no fluid, no mess

That last point matters. Brake bleeds are annoying, time-consuming, and easy to mess up. SRAM designed the B1 lever internals so the cam swap doesn’t open the hydraulic system. You’re removing and replacing mechanical components on the dry side of the lever body. If you can change a derailleur cable, you can do this.

I installed the kit on my A1 Mavens in about 8 minutes per side. The difference was immediate: the same modulation improvement I felt on the factory B1 brakes, on my existing calipers and lines. Given that a full Maven Ultimate lever retails for $249, the $69 upgrade kit is a significantly better value proposition for anyone already running Maven brakes.

One caveat: the upgrade kit gives you the SwingLink Gold cam improvement, but not the updated 4x18mm caliper pistons. If you want both changes, you need the full B1 caliper ($149) or the complete lever/caliper set. For most riders, the cam swap alone is the bigger improvement.

Maven Ultimate vs. Maven Silver: Which B1?

SRAM offers the B1 update across the Maven lineup, but the two main options split like this:

	Maven Ultimate B1	Maven Silver B1
Lever blade	Carbon fiber	CNC-machined forged aluminum
SwingLink	Gold cam	Gold cam
Caliper	4x18mm, forged	4x18mm, forged
Reach adjust	Tool-free	Tool-free
Contact adjust	Yes	Yes
Weight (lever)	~115g	~130g
Price (set)	$349/wheel	$249/wheel

Both get the SwingLink Gold cam. Both get the 4x18mm caliper. The $100 difference buys you the carbon lever blade and roughly 15g of weight savings per side. The carbon blade feels slightly stiffer under heavy pulls, but honestly, the difference is marginal. If you’re budgeting, the Silver B1 delivers the same braking performance.

On the Trail: Where the B1 Shines

Long Descents

Sustained braking on 10+ minute descents is where the modulation improvement pays off the most. I could hold a precise speed through extended rough sections without the fatigue that comes from constantly modulating an aggressive lever. My forearms were noticeably less pumped at the bottom of long runs compared to the A1.

Technical Steep Terrain

Tight switchbacks on steep grade require delicate braking. Too much and you lock the front, too little and you overshoot the turn. The B1’s linear power delivery made it easier to hold exact braking force through slow, technical moves. The old Maven worked here too, but it required more mental effort to manage the lever.

High-Speed Open Terrain

At speed on open trails, the B1 and A1 feel more similar. When you’re grabbing the lever hard for a high-speed scrub, both deliver the same stopping force. The B1’s modulation advantage is less relevant when you’re just asking for maximum power.

What It Doesn’t Do Well

The Maven B1 is still a Maven. That means:

• Lever reach is generous, which works for larger hands. Riders with smaller hands may find the ergonomics less ideal than Shimano’s lever shapes, even with reach adjustment dialed in.
• Pad compound matters. The stock metallic pads are loud when wet and take longer to bed in than Shimano resin pads. This isn’t a B1-specific issue, but it’s still part of the Maven experience.
• Bleed procedure hasn’t changed. When you do need a bleed, SRAM’s DOT fluid process is still more finicky than Shimano’s mineral oil system. The B1 upgrade kit avoids this, but eventual maintenance doesn’t.

vs. Shimano XT 4-Piston

The comparison most riders are making. Running both on the same trails, same sessions:

Shimano XT still has a slight edge in outright modulation feel at very low speeds — creeping over tech where you need the absolute minimum braking force. Shimano’s servo-wave mechanism does this really well.

Maven B1 has more raw power available when you need it, and the gap in modulation between the two is now much smaller than it was with the A1. If I had to pick one word: the Shimano feels “softer” through the lever stroke, the Maven feels “firmer.” Neither is objectively better. It’s preference.

For riders who want maximum power with improved feel: Maven B1. For riders who prioritize soft, organic lever feel above everything: Shimano XT. The B1 narrowed this gap considerably.

If you’re already in the SRAM ecosystem (SRAM XX DH wireless drivetrain, SRAM hubs), staying with Maven makes the most sense for parts and service consistency.

Setup and Maintenance

Initial setup is standard SRAM fare. Reach adjust and contact point adjust are both tool-free. I run reach about two clicks in from maximum extension, contact point one click from the default. The B1’s improved initial engagement means I set my contact point slightly further out than I did on the A1 because the brake engages earlier in the stroke, so I don’t need the pad as close to the rotor at rest.

Pad break-in took about two trail rides. The metallic pads SRAM ships are powerful once bedded but require patience. Don’t expect full performance on the first descent.

Rotor compatibility is unchanged: standard SRAM CenterLine or CenterLine X rotors, or any 6-bolt rotor. I ran 200mm front, 180mm rear. If you’re a heavier rider or riding long alpine descents, the 220mm CenterLine X rotor is worth considering for heat management.

Who Should Buy This

Maven A1 owners: The $69 upgrade kit is a no-brainer. Ten minutes of work, no bleed, and the modulation improvement is immediately noticeable. Best value upgrade in mountain bike brakes right now.

New brake shoppers: If you’ve been on the fence between Maven and Shimano because of the Maven’s aggressive initial engagement, the B1 addresses that specific complaint. It’s worth testing.

Enduro and gravity riders: The combination of raw power and improved modulation makes the B1 one of the best options for riders who need both. Pair with a proper suspension setup and you’ve got a confident descending platform.

Who Should Skip This

Happy A1 owners who’ve adapted: If you’ve dialed in your A1 lever feel and don’t find the modulation limiting, the improvement may not justify the spend — especially at $149+ for the caliper upgrade.

XC and light-trail riders: The Maven is overkill. A 2-piston brake with less weight and complexity will serve you better. Put the money toward tires that match your terrain instead.

Shimano loyalists who prefer soft lever feel: The B1 closed the modulation gap, but Maven still has a firmer, more mechanical feel through the stroke. If you love Shimano’s character, this won’t convert you.

The Bottom Line

The Maven B1 is the brake the original Maven should have been. Same power, dramatically better modulation, and SRAM was smart enough to make the key improvement available as a cheap, easy retrofit. The SwingLink Gold cam’s 50% reduction in breakaway force isn’t a marketing number — you feel it on the first pull.

The $69 upgrade kit is the standout here. For existing Maven owners, it’s the most impactful sub-$100 upgrade available in mountain biking right now. For new buyers, the B1 closes the modulation gap with Shimano while maintaining the raw power advantage that made the Maven the gravity brake of choice.

If you’re building up a new enduro rig or upgrading your current trail bike’s braking setup, the Maven B1 deserves a serious look.

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Tested on an enduro build, 170/160mm travel, rocky and steep technical terrain, late February through early March 2026. Weights are SRAM claimed specs.