What causes Throttle body sync and airbox boot cracks on the Bmw R 1100 S?

Rough idle, cracked rubber boots between airbox and throttle bodies Estimated fix cost: $100-$300

What causes ABS module failure and brake system leaks on the Bmw R 1100 S?

ABS warning light on, spongy brakes, inspect modulator for leaks Estimated fix cost: $200-$600

Noisy top end, ask for valve adjustment records every 6k miles Estimated fix cost: $150-$350

Known issues to inspect before buying a used Bmw R 1100 S. What to check and how much repairs cost.

MODERATE

Rough idle, cracked rubber boots between airbox and throttle bodies

Fix cost: $100-$300

SERIOUS

Clunking on acceleration, check service history for spline lubrication

Fix cost: $400-$900

MODERATE

ABS warning light on, spongy brakes, inspect modulator for leaks

Fix cost: $200-$600

MODERATE

Noisy top end, ask for valve adjustment records every 6k miles

Fix cost: $150-$350

☐Verify spline lubrication service history

☐Test ride for drivetrain clunks

☐Check all rubber boots for cracking

☐Confirm ABS light clears on startup

Solid boxer, maintenance-dependent, avoid neglected examples