If you booster fails (very hard pedal with very poor braking) 1st clue, stop immediately. You have just enter into a dangerous position. Can you stop?, barely if you have the leg strength. Can you panic stop NO and call BS on anyone that tells you different. Toyota get $550+ for a new brake booster, no reman available from Mr T Most aftermarket on-line and discount auto parts stores sell A1-Cardone including NAPA. Most of the reviews are good but a couple said the booster was a little different so I went with Amazon for the guaranteed delivery and return policy if I needed it. I paid a little more going with Amazon ($220) but for piece of mind with options I paid it. The booster was a perfect match and given the space you are working with you want a perfect match. The reman'd unit comes raw metal why? I primed and painted it Krylon Satin black to match. I unbolted the brake master and carefully pulled it away from the booster avoiding kinking the brake line to provide enough clearance for the old unit to come out. A couple more bolts, removed the brake pedal linkage, and moving of a couple item to make things easier the booster was ready to come out. Removal was a little challenging (tight) but raising the motor an inch makes a big difference (ya ya save it). Once removed I quickly realized I needed gaskets front and rear of the booster that were not included. This pisses me off because everyone is going to need them. 110 years ago I bought various gasket paper and punches because I was young (smarter than everyone) with no money and I could make gaskets cheaper than buying today again Im glad I did. With new gaskets in place I ever so carefully slide the new freshly painted in place. Amazingly it went 100x easier than removing it. At this point basically reverse the removal steps and you will be good to go. Now it stops without 750# leg presses.