Hot answers tagged

19 votes
Accepted

What is regenerative braking and why don't we use it?

tl;dr: We do. It's just expensive. One of the differences between electric and chemical energy motors is that the electric systems make it much more convenient to capture and retain energy (e.g., a ...
Bob Cross's user avatar
  • 24.4k
13 votes
Accepted

Holding clutch when braking

why using your clutch during braking can be considered unsafe I have ridden motorcycles for years. Engine braking is a component of safe riding. The engine itself can be ok and not receive any ...
DucatiKiller's user avatar
  • 32.9k
9 votes

What is regenerative braking and why don't we use it?

In answer to the question "What is regenerative braking and why don't we use it?", we do. With normal braking, forward momentum of the car is scrubbed off by the brakes by turning them into heat in ...
Steve Matthews's user avatar
7 votes
Accepted

Brakes Slipping/malfunctioning

The most common cause of intermittent brake failure is a faulty master cylinder. The master cylinder is similar to a bicycle pump. It moves brake fluid instead of air. Stepping on the brake pedal ...
mikes's user avatar
  • 19.9k
7 votes

"Keep in low gear" driving a gearless electric vehicle

Electric vehicles can "engine" brake by using the drive motors as generators. As they generate electricity they consume the car's potential energy - either from speed or elevation or both. The energy ...
dlu's user avatar
  • 14.5k
7 votes

Does engine braking an automatic wear out the transmission?

Basically, yes. Automatics don't have a clutch per se, but you're causing additional wear and tear on the internals. Basically you're reversing the power flow -- instead of the engine driving the ...
TMN's user avatar
  • 2,311
7 votes

What is regenerative braking and why don't we use it?

Regenerative braking is a system that stores the energy that instead would be lost to heat in the brakes. While these systems sound great they come with a whole host of their own problems. Before ...
vini_i's user avatar
  • 16k
7 votes
Accepted

Never declutch while braking at higher speeds: meaning

There are two things to think about here. (1) On a bike, engine braking only acts on the back wheel. If you press the clutch while you are braking hard, you change the "balance" of the ...
alephzero's user avatar
  • 2,954
6 votes
Accepted

Disengaging gear when braking/Coasting

If you're coming to stop, the inertia of the vehicle drives the wheels. This keeps the engine spinning if you don't touch the clutch until the absolute last moment. In your case it sounds like this is ...
Eric Urban's user avatar
  • 1,286
6 votes

New pads braking cause medium steering wheel vibration, shims were not replaced, rotors look good

Vibration through the steering wheel is generally caused by a defect in a rotating part or an imbalance in a rotating part. Note: neither pads nor shims rotate. If the problem is the same after you ...
Tim Nevins's user avatar
  • 1,046
5 votes
Accepted

Is my gas pedal long enough to enable heel-and-toe shifting?

Heel and Toe Pedals I think to truly heel-and-toe drive well, you need to have a setup similar to the one in the image. Something that's designed to do it proper. There's some that are super cheap. ...
DucatiKiller's user avatar
  • 32.9k
5 votes

Does Downshifting (Engine Braking) Cause Extra Wear and Tear?

Some answers correctly identified wear of synchronizers as a possible concern on manual transmission cars, but then they offered double-declutching as a solution. However, it is very hard to correctly ...
juhist's user avatar
  • 14.6k
5 votes

Stopping distance of a car

You cannot. You can't even do it that well with GPS. The only relevant OBD2 parameters are speed and RPMs. If the wheels are locked or traction is otherwise lost, neither of these can be used in the ...
Jason C's user avatar
  • 4,900
5 votes

Braking with left foot is sharper than doing with right foot

It is because you have, over years, “educated” your left foot /brain / muscle memory to hit the pedal and go to the floor ie clutch to change gear. You now have to re-learn the use of the left foot ...
Solar Mike's user avatar
  • 34.7k
5 votes
Accepted

Brake pedal goes to floor "sometimes" only

It's not a stupid question at all! You are right to be concerned, brakes are critical for safety and you need to deal with this before you get in an accident. The ABS light turning on while it was on ...
GdD's user avatar
  • 16.4k
5 votes
Accepted

Does engine braking help stop a car faster in an emergency?

No, it does not, at least not in a car that has a properly working braking system. In every modern car the brakes are capable of locking up the tires on both the front and rear axles. Today that ...
jwh20's user avatar
  • 12.1k
4 votes
Accepted

Car randomly pulls left or right when braking

What you are most likely experiencing is the pull from tires when breaking on uneven surface or road with grooves from heavy vehicles. If you have rather wide, sticky, square tires, this is what it ...
Alexus's user avatar
  • 550
4 votes

Car randomly pulls left or right when braking

If you have worn out steering parts, these can cause your issue, worn parts cause slack in the steering, when you brake it will pull to the side which has the most slack at the time. You can test for ...
Moab's user avatar
  • 8,010
4 votes

Mixing DOT 4 with DOT 4 synthetic

DOT 3, 4 AND 5.1 can be mixed. They are compatible. None of them are compatible with DOT 5 that's silicone-based. I just bought some Motul DOT 5.1 and it says on the front label: "NON-SILICONE base ...
Houckster's user avatar
3 votes

Holding clutch when braking

Holding the clutch while braking can make the rear wheel more likely to lock-up. Also you lose the additional engine braking.
user1751825's user avatar
3 votes

When braking and the car is near to stop I hear the sound of acceleration

I have a manual Subaru with electronic throttle control and this happens to me sometimes. The ECU is assuming that you are about to downshift, ie, into a parking lot or something similar. It increases ...
Nathan Tehrani's user avatar
3 votes

2001 Chevy Cavilier brake issue

Sounds like you have 2 problems. Brake pedal that goes down to the floor at a red light is a bad Master Cylinder, replace it Common issue as cars get higher mileage is the Thottle Body and throttle ...
Moab's user avatar
  • 8,010
3 votes

Mixing DOT 4 with DOT 4 synthetic

Manufacturers have been labeling their DOT3 and DOT4 products as "synthetic" as many consumers associate this with higher performance or quality similar to motor oil. But ALL brake fluids can be ...
masospaghetti's user avatar
3 votes

Car randomly pulls left or right when braking

I disagree that this is a wheel alignment issue, as the car is pulling randomly to either side - I'd expect alignment to either show no pulling, just tire wear, or to pull consistently to one side. I ...
PeteCon's user avatar
  • 8,702
3 votes

Can rotors be different thickness on both sides of the car?

Yes, rotors can be different thicknesses, as long as the active friction area is the same And they are above the minimum thickness. It is customary to fit new rotors in pairs when both are worn ...
Solar Mike's user avatar
  • 34.7k
2 votes

Car rolls back when braking at low speed on 14 ' Audi S4 (B8.5)

If it's the control arm bushings, you should notice that the wheel itself shifts a bit backward in the wheel well. It certainly is bad for other components as well as vehicle handling because you get ...
Alexus's user avatar
  • 550
2 votes

What is regenerative braking and why don't we use it?

We can do the next best thing. 1/2 mile (800m) ahead, I see a light turn yellow; at 60 mph (100kph) that's 30 seconds. And I know that light has about a 35 second cycle, plus 10 seconds for the ...
Harper - Reinstate Monica's user avatar
2 votes

What is regenerative braking and why don't we use it?

Regenerative braking is only really useful on electric or hybrid cars for the simple reason that they have a way to make use of the energy stored. Also once you have an electric motor as part of the ...
Chris Johns's user avatar
  • 1,596
2 votes

What is regenerative braking and why don't we use it?

Diesel-electric railroad locomotives do use regenerative braking, but they call it "dynamic braking". Also, they don't store the energy, they blow it off through resistor grids and fans at roof level....
stolenmoment's user avatar
2 votes

Is my gas pedal long enough to enable heel-and-toe shifting?

Typically the gas pedal is wider on manual cars to make heal toe easier. Heal toe shifting is not really be best name. You use the ball of your foot under your big toe on the edge of the brake ...
rpmerf's user avatar
  • 8,443

Only top scored, non community-wiki answers of a minimum length are eligible