Defect
On a small number of vehicles, a defective bolt may restrict fluid pressure to the brake caliper. As a result, there may be no braking on one wheel. If your vehicle has this problem, you may notice reduced braking, or feel the vehicle pull to the left or right while braking.
Safety Risk
Reduced braking could increase the risk of a crash.
Remedy
McLaren will notify owners by mail and instruct you to take your vehicle to a dealer to inspect the brake hose banjo bolt on each brake caliper. The bolts will be replaced, if required.