UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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If this is the brake pedal that is stiff this can be due to a fault with the brake master cylinder at fault needing replaced as it can fail internally or an issue with the brake booster itself as it can also fail internally causing this here.
You will need to have the brake system components tested to locate which is the cause here and then from there those components found at fault will need replaced to correct this issue here.
I have had to replace both in some cases if the master cylinder has leaked into the brake booster.
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