As far as the “clunk” noise I would start by checking the u joints. If it has been a while you might want to change the trans fluid and filter. Maybe check the fluid levels in the transfer case and differentials.
As far as the brakes, if the pedal feels hard to push down you might have a vacuum leak going to the brake booster or a bad brake booster. If the pedal goes down very easily your fluid may be low or you may have bad brake hoses. Bad brake hoses don’t always leak, if they expand they will not allow the required pressure to operate the brakes. If your brake fluid is a dark color you might want to change it. It is good practice to change your brake fluid every year or two. Brake fluid absorbs moisture from the air and that moisture degrades the fluid. Old brake fluid will compress under pressure and will not provide the neccessary pressure needed to operate the brakes.
Upgrading your brakes is never a bad idea but you should make sure the rest of the system is working correctly first.
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- Re: Getting rid of the Clunk Sound & Improve Braking!