Vibration when braking at a speed of 100 k \ ho more

Hello, I have a 1999 Fiat Brava 1.9 TD 75hp and for some time now I've noticed that when braking at speeds above 90 km/h, the car vibrates and makes a noise. I took it to the garage and they told me it was the discs and pads, so I replaced them. They were a bit worn, but the problem persisted, only slightly less intense. I went back to the garage and they said it was the tires, that they were very worn and not gripping the road. I changed the tires, but the problem remains.
I wanted to ask if you have any idea what this vibrating noise when braking could be?
I was thinking it might be the bushings. Does anyone have a manual to guide me on how to replace them or find a solution to the problem?

Thank you in advance.

Hi, besides changing the brake discs and tires, check how long ago you had your wheel alignment done. If it was done recently (which is advisable along with the discs), the new tires should obviously be properly balanced. If it continues to vibrate excessively when braking, there might be a problem with the suspension system, but not necessarily the silent blocks or strut mounts.
Sometimes, in this type of diagnosis, professionals (if they're not having a good day) can be guessing until they find the problem, but in the meantime, it's your wallet that's paying . Keep an eye on things.

Cheers

Okay, thank you very much. I'll go this afternoon to see how much they charge for wheel alignment, but I understood that when the alignment isn't correct, the tire wear is uneven, which wasn't the case for me since the tires I changed wore down evenly

Hello. They should check the hubs (where the discs sit) for runout because if the hubs are warped, tightening the wheel with the new disc will deform it. So you could put on 1000 discs, but if the hubs are bad, you'll still have the same problem

Hi: Here in Costa Rica, we call them rack and pinion joints; they're the ones that come out of the steering box. They might already be damaged, and you'd have to replace them. Usually, the inner ones are the ones that cause this problem. The outer ones can also cause it, but they're easier to detect. I think if you take it for an alignment (I think you call it a wheel alignment), they should be able to tell you if the outer ones are damaged, but they might not detect the inner ones until that part of the vehicle is disassembled.

I did the same thing as you; at least the car had new parts before they were damaged, but I still had the problem. The problem is with the suspension.

I hope this helps.

Greetings from Costa Rica