Questions tagged [brake-fluid]

Fluid used in the brake system to transfer pedal pressure to the caliper to stop or slow a vehicle. Commonly used types of brake fluid include DOT 3, DOT 4, DOT 5, and DOT 5.1. A higher "DOT" number indicates a higher boiling point of the fluid.

Filter by
Sorted by
Tagged with
5
votes
4answers
73k views

Spongy brakes after brake pad swap - moisture or bubbles?

I changed the rear brake pads on my BMW last week, following the steps outlined in this video. Unfortunately the brake pedal now feels spongy. The pedal feel was firm prior to the brake swap, so it ...
40
votes
7answers
610k views

what is the difference between DOT3 and DOT4 brake fluids?

What is the difference between DOT3 and DOT4 brake fluids? What could possibly go wrong if I use a (4 times cheaper) DOT3 brake fluid instead of the DOT4 which manufacturer recommends (but allows ...
14
votes
1answer
24k views

Cleaning brake fluid (general tips)

There are some other threads on other websites about cleaning up brake fluid. But I just wanted to get a more organized, concise answer here on SE. Wanted to confirm that cleaning up brake fluid just ...
7
votes
2answers
24k views

What are all the different types of fluid in a car and a short summary of their use?

A fluid is defined as anything that flows, hence for our purposes a gas or a liquid. I know that there is fuel, engine oil, engine coolant and brake fluid. Also air is normally taken in through a ...
10
votes
3answers
40k views

Using DOT4+ in clutch/brakes when DOT3 is recommended?

Looking at Wikipedia's DOT 3 page, it looks like it's been effectively superseded by DOT 4 fluid, but it's still sold and is still recommended on many forums. This question has an answer saying DOT 4 ...
8
votes
1answer
1k views

How do disk brake pistons retract?

If drum brakes consist of a several springs inside and outside the fluid cylinder to retract the brake shoes after braking, how disk brakes piston, that dont have any springs, can retract alone ...
4
votes
1answer
13k views

How to bleed Toyota Tacoma clutch system?

Vehicle: 2007 Toyota Tacoma 4WD v6 6 speed I found this tutorial on pre-bleeding but it is generic (not vehicle specific) and I think there are differences between the cylinder it uses and Tacoma's, ...
4
votes
3answers
6k views

Is it possible to tell if brake fluid needs to be flushed just by looking at it?

I've got spongy brake feel. This situation has me wondering if it is at all possible to tell that brake fluid needs changing just by looking at the fluid in the reservoir, similar to how you can tell ...
4
votes
2answers
3k views

Brake fluid reservoir level drops fast to minimum but not below

The brake fluid reservoir level drops very fast in my 2007 4WD V6 Toyota Tacoma, probably within 3-5 days of filling it up. The funny thing is, it drops to just below where it says minimum but not ...
4
votes
2answers
222 views

Is failing to change brake fluid a life safety issue?

While I recognise the the brake system in my car is redundant, is it possible that failure to replace brake fluid could result in a fatal accident? or is there sufficient redundancy and warning ...