Broken Wheel Lug Stud

What kind of car is this? A Gen 2 Prius has a 5-lug hub, yours has 4, well 3-1/2.

Removing the broken stud is easier than mounting the replacement stud. Remove the hub from the car, drive out the stud from the front to back with a punch or smaller diameter bolt and a hammer.

To mount the new stud you'll need a press or a wheel stud installation tool.

The lugnut you need is a mag style with washers. You mentioned some of the lugnuts on your wheels are missing the washers. Buy a replacement set and change them all.

The stud broke because someone overtorqued the lugnut. Washers would not help, there there to protect the wheel's finish from the turning lugnut.

Posted via the PriusChat mobile app.

 

This is the Gen 1 forum and so unsurprisingly it's a Gen 1. This is stated in his profile.

 

That’s not his vehicle in the YouTube video! His own photos show the four lug setup of the Gen.1.

 

@jamesprius most of your questions are about compatibility: just get replacement stud through dealership parts department.

You won’t need to bleed brakes, due to taking off caliper. I would though, disconnect neg battery cable prior to lifting off caliper, And after reassembly tromp brake pedal a few times (take up excess travel) and only then reconnect neg cable. The car may have a propensity to pressurize something, and this can be disastrous when the caliper’s off the rotor.

Talk to dealership service department too; considering having them do this. It’s not trivial, sometimes hub has to come off, air hammer may be needed, or cutting, depending on design. I’m a DIY duffer, have never needed to do this, would likely leave to the pros.

Clarify too: what model year is this?

 

I've replaced a stud or two on our Prime. Not sayin a Gen 1 will be the same, but I'll give a rundown of the basics so you can adjust for any differences with yours.
1: make sure the broken stud is furthest towards the front of the car before you break loose the lugs and jack the car.
2: remove wheel, remove caliber, remove pads and pad bracket, remove rotor
3: knockout broken stud. It's a press fit as you'll see looking at the new stud. It shouldn't be too hard to knock out the broken one, but ya never know. If the stud doesn't drop out after a couple hits with a hammer and punch of screwdriver, try some PB Blaster / WD40 and if all else fails some heat from a propane torch on the rotor around the broken stud. Fingers Crossed the stud pops right out after a couple smacks.
4: put the new stud into the hole, push it in as far as you can by hand, put one of the lugs on it and tighten it.
I've never needed any washers to seat the new stud, but you may want or need to use them. You can also seat the new stud using the wheel, but if you do remove the wheel and check that the new stud is seated all the way to the back of the hub.
5: reassemble the rotor, pads and pad bracket, caliper and wheel.

 

Toyota would have you use a pressing tool to press the broken stud out, not knocking/pounding/smacking. This can be done without removing the hub from the car.



Pounding is ok if you're planning to replace the hub anyway so you won't care what happens to the bearing. But if replacing the hub you get new studs anyway, so no need for pounding anything out of the old one.

 

Can't remove an old seized hub without banging the ever living sh*t out of it. Good info from Chapman, I never thought what might be happening to the bearing when striking a stud with a hammer.

I didn't have any trouble replacing break pads in my '01 without disconnecting the battery (unlike the Hylander Hybrid or Prius C I own(ed), the '01 doesn't make any noise when the ignition is turned off). I did use a break caliper compression tool, but not sure it's needed if putting original pads back in.

 

Typically not needed. Unless you’re replacing pads of course.

I’ve just used c-clamps to push pistons in. One of these plier style piston compressors would be handy though.

 

Failing to do that, the car "may" detect excess pedal travel, throw a code.

 

I've done wheel studs, but I've also tubed lawn mower tires. DIY it can be a pretty big PITA. Find a good, local tire shop. They do it in their sleep and with a lot less effort and fretting than you will do. It shouldn't break the bank.

 

I'll be sure to use some kind of press to remove broken wheel studs in the future.

I"ve never had an issue tapping out a broken wheel stud on out car, but it's not 20 years old either.
Thanks Chap !

 

Heat the caliper a little and use a long breaker bar on the socket or use an impact wrench.